Keycaps pictures

A quick post to show the keycaps being sent.

There’s no painting,

The letters are recessed into the keycaps and are very legible.

I’m working out postage costs as right now they’re still large letter in size here in the UK.

I probably won’t ship all of them them ‘on the supports’ as that doubles the weight

To fit them you just clip them onto your key switches

Example of a B Grade Set – note the blemishes on the F Keys
An example of an A Grade set – no obvious blemishes

Painting. I haven’t been able to find an effective way to do that my end. A few suggestions have come in, maybe White clay would work well finished with laquer.

C64 Mini Keyboard kits stock – First emails being sent out

Hi All,

I’ve now packed up 10 kits ready to be shipped and have emailed the first 10 people on the waiting list.

It’s been an expensive couple of months with the bad PCB’s and wrong arduinos, but, payday at the day job was two days ago, so i’ve already ordered enough additional parts to make everyone happy within a few weeks

I’ll work may way up through the waiting list and let you all know when I can finally make general stock available.

C64 upMini Keyboard kit – stock coming shortly

My New PCB’s will be here today! DHL shipping is expensive, but great when you need stuff quickly!

What this means – I should have general stock next week.

Timeline – I’ll get a test board built up this week. if that works, I’ll email out everyone who expressed an interest.

I’ll get everything kitted up through the week (time permitting) so I can get some posted this weekend.

The rest of the weekend will be spent kitting up everything I have so I can start selling again.

Sorry for the delay guys (and gals). Been a perfect storm of wrong components sent, big customs delays, non-functional PCB’s. I thought the ‘march’ timeline was generous and had plenty of padding in for worst case.

For general availability, i’ll be reviewing the price. Most things have gone up by over 20% in general (Brexit, Yaay), some have come down, and i’ve made some optimisations. These projects aren’t a get rich quick scheme for me, they’re just a way for me to get funds together to buy more tools and things to make more projects! It’s pretty much a cost neutral hobby 😛

One final update – Keycaps. I’ve started manufacturing and at the time of typing, I have sent out a few test items to kit owners. I’ll await some feedback before I can hit ‘go’ and make more.

Those are just some of the prints i’ve had to do to get to where I am now. This isn’t representative of the typical resin printing workflow. its generally a bit easier than this, BUT, I had to start from scratch, learning how to do everything, including stuff that hasn’t been done by others. AND I needed the base level print to be ‘perfect’ to avoid the need to paint them. There’s over 80 hours of actual printing time in this picture, on top of that, there’s the cleanup time, CAD time, setup time….these are the ‘successful’ failures, there’s almost as much again that i’ve binned due to total failures, where keycaps were unusuable for anything, not even experiments (as these ones have been used for). fortunatley most of those failures were caught early to avoid too much wasted resin….but when I get only 1 chance in the evenings on some days to quickly iterate, get the printer going, 1 failure can set me back a few days.

Anyways, now i’ve finalised everything……..

I’ve used an entire bottle of resin over the last couple of weeks making test manufacturing prints back to back to tune the process, changing nothing, just print, print, print… By that, I mean, it’s…

  • Print
  • Remove Print, clean up
  • top up resin
  • print
  • Cure cleaned up print
  • repeat until bottle is empty

I’m now at about 70% success rate for good saleable keycaps. the other 20% have minor blotches or surface uniformity issues, so i’ll sell those discounted for those that are interested. I’m still getting about 1 in 1o that can’t be used in any way.

Good enough, and i’m sure i’ll get better as time goes on. Each print takes 6.5 hours – slow, but reliable and a 25uM layer height so about as good as it gets on resin printing for surface finish.

Each print also takes another 30 minutes or so to ‘turn around’ –

  • Remove from bed
  • clean bed
  • set printer up again to print the next item
  • clean print (1 minute soak in IPA, then 5 minutes in ultrasonic bath then another couple of minutes under a warm running tap)
  • Dry Print – This is critical to good finishes. Some are taking up to 3 days, overnight in cardboard boxes near the radiator. I need to do a few checks in that time to ‘dab off’ excess moisture that leeches out of the print. Any moisture left on the tops of the keycaps alters the surface finish.
  • Cure print – this takes time also. I’ve found using UV lights (wash and cure station) warps the keys more often than not. Once the caps are dry, I leave them a couple of days in the conservatory. After that, i’ll blast them for a few minutes under UV light to finish the curing
  • Then it’s pack them up ready for posting!

And, Pack some up, ready for posting I have! I’ve done a mix of ‘on the supports’ and ‘loose in bags’ to see how these things go. I’ve posted a couple to myself via friends overseas to see if they survive!. once I know what i’m doing is working, I’ll make them available for sale!

8 sets of keycaps ready to go, waiting feedback from testers before I can ship!

Tolerance!

The mechanical, fitty holey type tolerance, not the other type of ‘oh, that’s annoying, but i’ll put up with it’ type….

Here’s the keyswitch fitting into the space bar. zoom in. we’re talking fractions of a millimeter fit, which I can achieve consistently and reliably! there’s about 0.1 mm available on the sides with the latches and about 0.2mm availavle on the longer sides. the extra really being there to allow some grace when placing the keycap on to fit it. less clearance means it’s a royal pain to get the switch located into the hole.

BUT, the keys don’t ‘latch’ into place on the switches. So, to try to address that (if it’s even possible) i’m now adding a small feature

See that bit in Blue!

This is the underside of one of the ‘F’ Keys. That small part in blue is a 0.1mm ridge sat about 0.8mm up from the bottom and 1mm from the top. I’m hoping that will be enough to latch the keys on, AND allow ease of fitting without breaking the keycaps. Everything else is done now, this is the only barrier to releasing. I’ll run off a print tomorrow to see how it works out. I’ll run off further prints with this sticking out even more if i need to

Just one more Tweaketto! Give it to me…C64 keycap sales are soon to be..

Nailed it!

Happy chappy this morning. They finished printing last night, my draining widget worked a treat – I’ll put a quick GIF up soon.

But, forgot about them until a mad panic at close to 1AM remembering I’d left them on the printer. With these, you can’t as the resin in the concave surfaces will part set in the morning and cause an uneven surface.

So, quickly washed them in IPA, regretted it immediately as it was dirty. Did another wash in IPA to clean the resin and straight to the hot water tap and larger bowl with a brush to clean off the bits. I’ll strain out the bowl later.

Final tweak needed now is the amount of grip to the switches themselves, shrinkage is variable at the moment, can’t go too small or keycaps may break when putting on, can’t go too big or they’ll be too wobbly and fall off.

May need to go middle ground and require a tiny blob of something sticky in each keycap, I’ll know soon enough!

Space Bar, The final frontier

The final hurdle for ‘good enough’ for me now is the space bar.

Every key prints lovely, except the largest one……Take a look

Eeeeew, kinda looks like a ….

I’ve gotten all the ‘hard stuff’ over and done with first, or so I thought. Life’s taught me to generally avoid going for the low hanging fruit first, save the easy stuff for later when you need a boost.

Well, no matter what i’ve done (so far) in 12 iterations, have I been able to get a good looking space bar.

Now this has become my sole focus and roadblock for a successful print

Turns out that this is a combination of quite a few variables, I’ll list a few and probably follow up another time with clicky links and research

  • Exposure times are wrong –
    • They could be , I’ve really just gone and shoved stuff in to print and hoped for the best with standard settings. I Have now tweaked up the settings a little bit to 2.2s per layer due to mixing pigment in, and have had no real failures. I’ve also increased the first layers exposure times to 30s, still seeing minor issues there
  • FEP tension is wrong
    • Not really, This is a brand new printer, i’ve had zero catastrophic failures and have been overly cautious monitoring (and catching) early delamination from the print bed issues – Three times now
  • Bad Resin
    • Possibly. I’ve 3 types (all anycubic) and seeing the same on all 3
  • Temperature
    • Possibly, lots of people have been reporting issues in cold climates, I use the printer in the conservatory and it’s sub 10 degrees C in there regularly
    • Low temperatures cause increased viscosity and warpage issues with fine features from the FEP pulling them through the thicker resin
  • MY FAVOURITE
    • Exposure –
      • Too low exposure times on fine edges cause resin to cure, but not as hard as it should. So, when the layer sets on the bed, when it’s pulled off the FEP, it warps as it’s soft. This, I believe is causing the sagging issues i’m seeing on that space bar – it’s printed upside down, so the supports hold the points up, and between the walls sag, like an electric line held between two pylons

My solution……

Probaly waaay too many supports, but this way, each ‘sag’ will be between supports that are just 1mm apart.

I’ve also nearly doubled the wall thickness to about 1.8mm – from 1mm

Blue lines show original thickness, gold shows it doubled

Hopefully now, this is the last step, Colour’s good, CAD is good, Supports are good.

I’ve ordered 2 Litres of clear resin ready to go and have a colour that’s not exact, but close and, importantly , very easy to re-create

Resin8 Earthy Brown, 3 ‘blobs’ of the end of a lollypop stick to 100ml of resin. and Black, 1 blob.

– The Rich brown used previously was too red. I’ll experiment a little with more black when running off the final tests

https://www.resin8.co.uk/opaque-resin-pigment—earthy-brown-7468-p.asp

https://www.resin8.co.uk/opaque-resin-pigment—black-2383-p.asp

Coming soon!, more kits in stock, and Keycaps – March 2021!

Is that a space bar in your pocket (sized C64 Mini) ?

Trial run 13 underway with the resin prints. Colour should be pretty close, and Supports fairly optimal.

Trial 12 failed due to insufficient base size on the supports, caught it at 5% so no problem there other than a quick cleanup. I’ll know how it’s gone in about 5 hours!

Also, did a quick tweak on the space bar! I’m printing both new and old to see how they come out

Do animated GIF’s work here?

Did some work on the Blinkenator also, and got sidetracked quite significantly with Fusion360’s parametric sketches. watch those tangent curves and how you constrain them!.

Mwahahahaha! C64 mini keycaps! The final furlong :-)

Has some successes with varying mixes of pigments! Wifey demanded I do a bronze one.

Fine adjustments needed only now and it’ll be a wrap.

….problem is, fine adjustments’ll probably take another 80% of the total :-p

Now, gotta figure out how to get Arduinos quickly as 50 wrong ones just turned up and due to Chinese New Year my expedited (expensive) DHL delivery won’t leave for a couple of weeks, D’oh! Best laid plans….

Well, final furlong for the 3D printing part anyway! Next step, investigating colouring in

Oops! One of these is near, the other is far away!

C64 mini keyboard kit keycaps – Rev 6 and 7

Couple of successful prints! Rev 6 – just binging in stuff and hoping it works.

Rev 7 – more scientific and better CAD – all letters are now 0.2mm wider and deeper. This tiny tweak shows spectacularly well just how big a difference small changes can make.

Still some more CAD to do but soo close to final now!

Bottom row and space bar is Rev 7. Top 3 rows are Rev 6
Closeup of the better definition.

And, finally, the print itself. I’ve learned that supports are critical here. Lots of them!

There’s actually as much material here in the supports as there is in the keycaps, but if you scrimp a little and try to reduce the amount, check out the top left of the picture below. I lost the return key and a few smaller keys were taken with it.

This was a calculated ‘risk’ by leaving this section to just have the standard auto generated supports, every other area had super dense supports.

There will be a middle ground, which I’m working on as I’d like to offer these cheaply…less resin used = cheaper to make!

Also, note the rest of the supports. THey are SO EASY to remove. When I offer these keycaps for sale, again to reduce cost, I’ll probably leave them as you see here. Makes for more robust packing and if you decide to paint them, you already have them held down on a convenient stand!

Cured and partly disassembled

Sweet like chocolate! (C64 mini key caps)

Well, experiment 1 worked a treat!

I purchased this pigment from Resin8

https://www.resin8.co.uk/opaque-resin-pigment—rich-brown-9247-p.asp

Added a blob – maybe 1-2ml worth off the end of a lollipop stick

Stirred that in with 150ml (well, about 150g by weight as that’s far easier, and it’s close enough) of Anycubic grey resin

And….

Very happy! Considering this is literally bunging stuff in and seeing what happened.

Still some way to go now to try the other clear resin and white resins, also tweaking the colours

Also have I some distortion issues on these keys but those are under control as there’s a very clear relationship between support structures and distortion/warping and underside finish!

I think I’m on track for a March launch!

Anyone for a Brownie? (C64 Brown!)

Started a print tonight! Version 6 🙂

That colour may not look correct but it’s not intended to be perfect,

I need to iterate this process slowly and scientifically so I can recreate the colour at any time.

Best place to start is from a known working point and changing a single variable at a time to get to where you want to be

Here, I’m starting with the resin I know works – drab grey.

I’m adding an unknown if it works brown pigment just to see what happens!

If that prints, I can try adding black pigment to make it darker brown.

If it doesn’t, I can try using a CMYK mix of colours to make the correct Brown

Once I get that shade, I can try different resin bases to see what gives the best finish! Maybe clear + brown or white +CMYK will do the job!

I’ll be iterating the CAD model and the colouring at the same time!

Hopefully this new CAD model will fix the minor offset issues with the keyboard, shifting all the keys slightly to the right also allowing me to finally reveal a working test fit!

One small thing I picked up when test fitting my first attempt, I’d not perfectly centred the left shift key button and Return buttons on the PCB. It doesn’t matter in the grand scheme of things as hacking your own keycaps doesn’t need perfect alignment on the wider keys, only the 1 wide keys

Where it is annoying though is I can’t correct this error or any keycaps I make now won’t perfectly align on old keyboards! Heh, what’s 1/2mm between friends eh!

All kits posted! (Except for 1 assembled)

If you’ve purchased a kit this past couple of weeks, it’s now been posted.

I’ve only 1 remaining kit to post, but first I have to solder it (Mr L D from Italy, I’ll start it this weekend)

I’m doubling down on keycap development now, hoping to have those ready in time for new stock

Let’s say March 1st to be safe, hopefully a little sooner if parts arrive quicker 🙂

Hello!

Just a quick ‘Hi’ to anyone popping in from Retro Recipes!

And, if you’re just browsing here due to something else, go, have a look at Retro Recipes!

Whilst you’re there, go check out my “This Old Tony” style cameo in the video 🙂 ! yes, that’s official, it’s my HOLLYWOOD DEBUT!.

Oh, And it’s a little video about the C64 Mini keyboard kits, and a little reveal!

And, to get in touch, ping an email to KEYBOARDS AT Bleugh.biz

Cheers

Dean

C64 Mini – Cheap and easy keycap ‘solution’

It’s taking ages to get progress on the 3D printed keycaps, I’m so close, but still have a few months of tweaking until I get it perfect enough to consider it a saleable item. watch this space 🙂

In the interim, I went and purchased a bunch of these

https://www.aliexpress.com/item/1005001616660795.html?spm=a2g0s.9042311.0.0.27424c4dI4vhMo

They’re a “100Pcs A28 Tactile Push Button Switch Cap 6*5.1mm Applies to 5.8*5.8 7*7 8*8 8.5*8.5 Self-Locking Switch Button Cap”

And, judge for yourself……

Old school!

Err.

Well, it’s more comfortable than nothing, and certainly opens up some options for unusual keyboards in the future 😛

yes, it’s not perfect, BUT for £1.68 you can have non painful pokey bits and actually do a reasonable job of typing on basic

or, splash out £3.36 and go for a dual colour like I did 😛

BONUS PRIZE TIME………………..[edit, grabbed by someone! ]

THE first person to order a kit and mention that they want these keycaps, I’ll chuck in a set of grey/black ones as pictured for nothing – I purchased enough to do properly do 2.5 keyboards, or 3 if you don’t mind a mix / match of black and grey!

Note, if you’re ordering your own keycaps off aliexpress, the internal dimension is key here, they fit, you can go a little smaller

the absolute maximum external dimension is 9mm, this leaves about 0.48mm clearance between keycaps.

C64 Mini keycaps, Bleugh’s Log, date 12012021….second print!

This one went well 🙂

Note, the intentional ‘stone effect’ finish 😉

Most people would say this was caused by an over excited person, whom, upon waking early and discovering the complete print decided to not follow the correct drying / washing procedures in order to get it finished quickly!

I, err, disagree…

Either way, I now have a firm grasp of changes needed to the CAD model and also the supports needed in the slicer.

Those changes are fairly substantial, so I expect it’ll be a little while for my next update, happy to document them also if anyone’s interested.

Freshly dried and washed
Perfect size
A quick comparison

Keycaps progress! Still a long way to go….

Hot off the printer!
Somehow I lost the E again

Wow! An exciting day today.

After quite some nervous trepidation, I finally shoved some resin into the printer and achieved my first ever resin print.

And, amazingly, some stuff worked! Significantly more than I’d expected to work actually.

I’ve been quite ‘scared’ of actually starting a print, I‘ve read too much about toxicity and fumes, which aren’t things you want with two young kids.

Well, I spent a couple of hours doing some final reading, and setting up on the dining room table. Levelled the bed, levelled it again. Shoved in the resin and…a Spectacular success for me!

I know the print failed mainly due to poor supports, some text is also too fine. Both were concerns with the cad and the slicer and easily fixed 🙂 there’s probably a dozen other issues I’ve not found yet also (it’s been 30 minutes since I wash and cured them fresh off the printer)

Next step, iterating, optimising . It could be done in a few weeks at print 3, it could be print 10 and take a few months , but now I’m over the first hurdle, onwards and upwards!!

Here’s looking at U

C64 Mini Keycaps – Xmas CAD Milestone!

Doesn’t look like much. BUT

They’re all now working! I just need to tweak only 10 keys settings to significantly alter the entire keyboard – those 10 parent keys are copied through the rows

And I can now also alter all keyswitch holes simultaneously by changing two parameters.

Next step, latching mechanism in the holes (a small, sticky outy lump) and then figuring out how to print it!

Underside Wireframe view of the Return Key
Wireframe view showing the F Key Geometry

C64 Mini Keyboard – Small bit of Keycap Progress

It’s going to be a while yet, but I’ve finally fixed some long standing issues with the keyboard model i’ve been building in Fusion360

Doesn’t look like much!?

The main issue was a badly created model!. I’ve junked quite a lot and started back prior to when some odd dependencies crept in and really put some roadblocks on scaling things correctly and adding finishing touches.

But, it’s been worth it

That previous picture is the underside of the Keyboard – Those holes in the keys are 2.2 x 2.8 holes. it’s a first run at fitting the key switches into the keycaps. a lot more iteration needed to hollow it out a little and create some form of inbuilt snap-fit with stress relief, but…it’s a start!

The silver / grey keys over on the left are the ‘parent’ keys

If I make an update to the curves or size of a parent key – it rolls out to all the same sized keys in its row

if I need to iterate the hole size for the key switches, I simply change a few parameters for the hole size and it rolls out to all the keys in one go.

I’ve taken so long to develop it parametrically as it’ll now be so much quicker to iterate

Lots of parameters to change!

and, here’s a new render!……..going to spend the next few weeks iterating, and hopefully over Christmas , fire up the resin 3D printer for the first time!

C64 Mini Keyboard Kit – Contents

Just realised that it’s not easy to find an image to show what’s in a kit.

Here goes


what you need to add;

  • YOUR OWN KEYCAPS – Freshly butchered
  • plaster of paris / silicon for the mould
  • Solder
  • Glue

What’s In the Kit

  • 1 pre programmed arduino pro micro with headers
  • 70 normal switches
  • 1 locking switch
  • 70 diodes
  • 1 PCB
  • 1 USB hub
  • 1 4 core wire
  • 2 short USB cables one of which you cut the end off if you want, or cut / reuse the USB hub one)
  • 4 Screws (to help align the mould)
  • 1 3D printed plastic mould / jig to create a mould to put your keycaps on straight
  • 2 small pieces of heat shrink tubing

C64 Mini not included, but this is what yours will look like once you’ve assembled the kit

Coming at some point in the future (late 2021 at this rate) – 3D, resin printed Keycaps!

Another C64 Mini keyboard kit success

A very talented Hans Liss from the Facebook group – TheC64 Mini has make a perfect assembled kit.

Drool over the photos below

Note the extras like the hacked up USB hub to make it slimline

The Extra UART connector that he’s added, and the nigh on perfect Keybaord keycap butchery!

Hans also helped by pointing out a few errors i’ve made with the original firmware sent out with the kits. I spent a couple of weeks figuring out how to fix it and have a new HEX file for those that want it.

There’s still some ‘not quite exactly commodore’ quirkery happening – which i’m working on, but i’ll bet that 99% of you won’t be able to figure it out. I’ve only found out due to Hans’s extensive knowledge of the C64 inner workings and also me, downloading the original user manual for the Commodore 64.

TheC64 mini Keybaord kit – a successful first build by a user

Batches 4 and 5 have started arriving! Here’s some pictures from a happy user who only received it a couple of days ago 🙂

Great soldering job 🙂

Good soldering job on the rear too.
Great use of the heat shrink to tidy the invisible mod up!

C64Mini keyboard kits shipped!

First batch of 15 kits shipped!

Postage on most was actually slightly cheaper than last time! But the two heaviest ones were more, the largest one was quite a bit more than anticipated…so it all averaged out ok…

One repeat customer has a couple of freebies, only one assembled this time!

Also my first ever customer finally will have a spare kit and some stuff to practice with 🙂

Next small batch is coming as soon as the 20cm USB cables arrive.

If you want a kit without the short, tidy looking USB cables then shout and I’ll do a small discount 🙂

Amusing story and reversed switches on the C64 mini keyboard kits

Correct orientation of the switches
Correct orientation from the top. (Except the shift lock…oops! That’s why I put extra switches in :-p)

A funny story about multi sourcing components and the importance of testing before shipping!

I used a supplier on Aliexpress to purchase a few thousand switches in a few orders over a few months but their prices went up quite drastically after the last order (doubled!!) they weren’t the cheapest to start with but were reliable and friendly, worth the extra ££

I found another supplier who did a good deal for a full bag of 4000! Ordered them and waited, very quick delivery and friendly also (will buy again!)

I built my first test new keyboard with the new PCB and switches

It didn’t work. Well, actually, it did! Work perfectly…but in reverse :-p …..

If you mashed every key simultaneously then only released the key you want to press….it worked!! Yeah, the supplier sent me 4000 ‘inverted’ switches! My fault for not checking prior to ordering, they ‘look the same’ so ‘must be the same’ was a wrong assumption on my part! (At least they all weren’t the shift lock type!!)

It’s a VERY easy fix though (found after several panicked hours of testing and building Keyboards)…rotate the switch 180 degrees and it’s perfect!

In each kit I’ve included a small errata note and list of basic instructions to help. It’s an annoyance but for you guys it really just means the silk screen doesn’t quite match the switch orientation so just ask first. Look at the pictures and of any doubt, email/messenger/twitter/Reddit me 🙂

C64 Mini Keyboard kits, ready to go :-)

I’ve a small batch of 14 kits assembled and ready to post 🙂

The ‘slightly open’ ones are waiting their 3D printed inserts which are taking about 6.5 hours for 3 right now 🙂

Send me a message if you are reading and would like one.

I have enough parts to make 50 kits all up, except for the USB cables – I’ve lost a large bag of them somewhere so have ordered more 🙂

C64 Mini Keyboard kit – a successful user :-)

By reddit user mfriethm. Looks amazing

I sold the first batch of kits mostly on Reddit

Over the past few weeks they’ve been making their way around the globe and I’ve had a lot of happy reports back

Today, Ive been able to relax finally, the Mould works 🙂

Reddit users fantastic gallery

He’s done an amazing job using a silicone mould!

The workflow – make a mould of your uncut keybaord

Cut the keys out, tidy them up

Place keys in mould

Put glue in keys

Place keyboard on top and use screws to align

Voila!

C64 mini Quick doodle for the USB hub mod

Had someone ask, so here’s a quick and rough explanation

You need to make SIX solder connections

First, lift the centre two pins of USB1 on the mini

Second, cut off the plug and solder four pins from the USB hub cable to the bottom of the USB1 connector pads on the PCB

Third, cut off the mini USB of the longer USB cable and create a bare end. Solder two data wires to the lifted pins on the mini’s USB connecote

This then attaches the USB hub in full to the minis processor

And just uses the physical connector on the mini as an extension of one of the sockets on the hub!

Assembly of the C64 Mini working keyboard kit! – PICTURES

Follows a couple of pictures of the install, I’ve also put a couple of videos up on youtube. More will follow

DIODE orientation. Note, make sure they’re all the same way round. One here isn’t!

I’ve put some videos up on youtube about the assembly process – the playlist is linked below

Putting the switches in Wonky for the first round of alignment (smt diodes hand soldered on the original prototype)

Make sure you solder the arduino headers on before you get this far with the switches

Back of board showing Diode legs clipped and only ONE switch pin tacked per switch

USB HUB TO FOLLOW – Pictures shown in blog previously if you need them quickly