When you buy a 3D printer, sometimes you search for ages to find ‘anything’ to print, just to actually use the printer.
Other times, you spend ages searching for a suitable coupling device to mount a pool pump with a roughly 1/2 inch inner bore and 20mm ish unknown thread to a 31ish mm diameter INTEX style corrugated hose……..
I’ve done both.
I bought some solar pool heating mats to make the small 8 foot paddling pool a little toastier and less ‘my nipples are so stiff , they could cut glass’ cold……
I’ve no idea what the thread is….So decided to set the inner hole just big enough to catch the thread…To screw it on, I use my hot air gun to heat up the inner hole so that it gets soft, then screw on the adaptor. leave it to go cold, then unscrew, add PTFE Tape to the threads, screw it back on and, voila, a nice, waterproof adaptor.
I’ll test the thing soon (it’s warm here)………But, during typing this, I’ve noted that the Bestway pump is 330 Gallons per hour – approximatley 1500 Liters per hour
The Aliexpress pump is about half that, D’oh!….
BUT – where i’m hoping to create an efficiency – the Bestway pump has a filter built in, which quite severely restricts the flow, this pump willl either boost that, or i’ll split the 4 mats into two circuits!
Have spent a few hours fine tuning alignments – with the new ‘underneath’ mounting of the solderless Blinkenator trial, some of the alignment changes.
The J15 Connector shifts away from the edge about 3/4 mm due to the curvature of the next case, which also needs the larger pillar holes to be moved and increased in size a little.
The print fitted almost perfectly, slight misalignment with J15, I’ll probably make the two locating holes a little larger to allow a little play. The 3D print won’t be the exact same dimensions as the manufactured PCB but it’s close enough to see what tweaks are needed.
And, finally an update on the new next is at Kickstarter!!
Have been having a little bit of a creative Block with the Blinkenator. It’s a typical story where ‘something shiny’ has been spotted and has been taking up the small chunks of time I’d normally allocate to this stuff.
I’m awaiting on those Pogo pins to test the next revision…….But, have also seriously re-thought the programminator / tester device…….And, we have what you see above
40 Pin Raspberry Pi connector will allow some ‘playing’ around with the ESP device, and programming of the Arduino. I’ll need to figure out exactly how to write the software to do it- but, there’s dozens of tutorials out there so i’m confident.
Programming could also be done via a standard 6 or 10 pin ICSP device (that can be bought for a few quid off Ebay) directly on the blinkenator itself, or via the 9 pin connector at the bottom – which breaks out to the Programminator.
The Programminator also utilises the J15 connector of the Blinkenator – This should be a great way of testing the new Pogo pins connections as my Specnext J15 is fairly well shot
There’s 2 new holes – 57mm spaced (same as a Raspberry Pi!) which can sit standoffs which match the positioning on the programminator (rasperry pi footprint)
Took quite a while to get this far – now at least you should be able to see the LED’s doing their stuff whilst connected to a Pi and a test board!
I’m very close now to getting this new board done as a BETA….next step is to print out, test fit and tweak
In other Interesting news, JLCPCB ‘s NEW version of EasyEDA exports OBJ files! I’ve literally just discovered that you can EXPORT a 3D model of your PCB.
Assemble your bits – whack ‘print’ and, send to a 3D printer. Or put into your favourite slicer program and do the same – I’ll have a little bit more of a play tomorrow – it’s 11PM now. Now, to use the Resin printer or the Filament one 🙂
Oh, as for the ‘something shiny’ that’s come along…..Checking the logs in Fusion360, I started back on the 8th February. Since then I’ve easily spent 200+ hours editing, tweaking, Learning. I made the first 3D print last week. There will be many more prints till it’s ‘final’ .
There’ll be a few versions of electronics inside, Basic version will likley be some type of Raspberry Pi – Compute Module , A design is well underway. I’m also possibly thinking of dabbling in FPGA, though a 6 layer double sided PCB is a bit daunting, I’m designing one anyway after gaining a big bit of help from someone who’s already familiar with FPGA’s
I’m being vague as I really don’t know where this one’s going. I’ll need to show this publicly, once it’s done and then see what occurs. I’ll need a new, larger resin printer for sure if it takes off though, it uses the entire build volume of my Anycubic Photon Mono printing off the two larger pieces at an angle!
I’m still trying to make this darn thing solderless….and, I have possibly a lead, which ain’t cheap…but will allow me to offer two versions.
Those gold things are pogo pins. But, slightly less common ones with a 1.2mm diameter pin part. This should sit quite nicely into the Next’s 1mm holes in J15…..except in my excitement, I forgot about that darn keyboard connector!
Using these requires yet another redesign, but a relatively minor one that only needs the connector stuff soldered on the reverse of the PCB…
On the plus side, this could make end user fitting of the inserts a little easier 🙂
As for ‘expensive’ – those pogo pins are around £1 each and at least 6 will be needed, more if the wifi relocation is used!
Just a quick photo of me holding my Next up against a snowy scene!
And aaaaanother Beta!. Doing significantly more testing this time round
Still not quite over the roadblock for the solderless BETA, but have kinda proven that the ‘programminator’ idea doesn’t really work as well as hoped. BUT, i have proven that a simple 9 pin JST-PH connector – 1.27mm pitch will work – also known as a molex picoblade style.
Going forward, this will be the way someone programs up the Blinkenator. I’ll have another board – possibly included with every blinkenator to convert this to a standard USBASP style header, unsure yet, depends on just how easy I can make the 6 pin header up on the top right to access. would be nice if people can program it up with their case closed….we’ll see
I’m hoping to double down on the blinkenator over the coming weeks, still quite a bit to finalise with the code and the LED inserts!….fun fun.
and, yes, my small digression with the 90’s miniatures is actually a disguised learning excercise. My LED inserts have some fantastically small detail. i’m now learning how to use supports properly….which will dramatically speed up development time on 3D printed inserts. and, also provide a proper path / workflow to being able to get them injection moulded….IF the budget and interest allows. My early experiments however suggest, I may just about be able to achieve an injection moulding style ‘gloss’ finish with 3D printing….keep tuned in!
If you’ve paid for a kit or just keycaps or waiting on spare parts, it’s now posted.
Missed the Saturday run to the post office so sorry about that.
I’ve now a small amount of stock of keycaps and plenty of kits so I can relax a little and have fun printing other stuff for a change! Can you believe that I’ve run at least 6L of resin through the printer …JUST developing and then selling these keycaps, I’ve never printed anything else on it 🙂
A quick pictorial ! on the process of creating keycaps.
I’ve missed out a few pictures, but this covers the basics. Using a timer, it’s around half hour all-up per keyboard. Sometimes a little more if a print fails!
Tried to make a ‘GOLD’ keyboard but need to research a little on how to keep the particles suspended. This one failed due to too much gold. It all sunk to the bottom causing layers to become underexposed and ultimately sticking to the FEP
Also tried to make a crystal clear keyboard…unfortunately I topped up the vat with a tiny bit of the gold mix from a poorly labelled bottle I use f or mixing (I didn’t write any label!) I’ll give these away with a kit to the first person that asks 🙂
Quite late into development, I’d realised that the F keys were supposed to be a different colour. So, I add two sets of F keys to kits. Some early ones went out without the extras. Happy to send some out if you shout.
Switches will be here in a day or two!, i’ll email everyone about kits shortly.
Purchased some ‘old gold’ pigment from https://www.resin8.co.uk/ and tried it with the keycaps for something different. Came out ‘ok’ – nice and gold on the top, but lacking in gold on the sides. I suspect the particles weren’t being agitated sufficiently and sank to the bottom.
I’ll try again soon with a higher concentration of pigment and see how that goes before considering offering these as a product!
Was just about to order another 4000 switches and take the hit…Decided to check the tracking number and FINALLY, after a month in Limbo, the switches have been released from Liege, the infamously slow sorting centre in Brussels.
SO, should be here next week and i can Finally get sending kits out!
Sorry again about the delays, I’ve now bought excessive stock so, should be able to turn around things quite quickly.
also built up a little stock of the keycaps which can be included in the kits at no additional postage cost
Beta 11 had a minor cock-up in that i’d missed off the 3v3 line. I’ve also taken the oportunity to shift things around a bit, re-align stuff and generally do a lot of really picky small stuff that generally makes me feel a bit better. Except that upside down C22 that i’ve just spotted, D’oh!
Also, I now introduce 2 more members of the Super LED Blinkenator 2000 family
This one, you’ve kind of met before. It’s a small ‘clamp’ PCB, but it now splits into two parts. One ‘spacer / shim’ sits in-between the Clampy larger bit, the other, is the clampy larger bit.
When installed, it’ll look a little something like this…..
Blue is the Next PCB. Red is the tiny thin break-off ‘spacer’. Black is the Blinkenator.
The Red ‘shim’ part stops the yellow clamping PCB from getting too close to the Blinkenator when the screws and nuts are tightened.
That combination of PCB’s, copper balls, nuts & bolts provides a robust electrical contact to J15 – Without needing to solder. Yes, it’s a little fiddly – I’ll make some instructions.
Another Member – The Programminator
Now i’ve switched over to a SMT atmega chip, it needs programming. I’ve bought some of the important signals out to a PCI EXpress connector to make for me, at Bleugh.Biz headquarters to quickly program the on-board arduino and test some basic features.
I thinkn REV 2 of this board could be useful for general tinkering also, so i’ll probably do a limited run to sell if people really want them. I’ll send out a handful of REV1 of this board to the BETA testers, IF BETA12 works.
And, finally – a quick overview of the new layout and routing. I’m now confident enough in the design to use a copper pour for a much more professional finish!
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.
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…
Remove Print, clean up
top up resin
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
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!
Arduino’s are still stuck in Limbo. I received 50 incorrect ones a long while back, ordered another 50 and they’ve been stuck somewhere in the UK for a couple of weeks now. I did order 10 locally at about 2x the price I normally pay to work through some of the waiting list, but that exhaused my supply of PCB’s
So, I ordered back at the beginning of February some more PCB’s
They arrived yesterday, and, I quickly soldered one up to test, so I can start ‘kitting up’ the keyboard kits.
I may have discovered an issue with the way that i’m Using EASYEDA, which has recently shown up in an EASYEDA update….it could be a bug, or a behaviour change, but, it’s B0rked my PCB!
This will set back the kit availability a couple of weeks whilst I address it and get new boards made. I know what the issue is, I can re-create it and have a work around to order more PCB’s so it’s no major worry
Here’s the C64 Keybaord matrix that i’m using. I’ve always used number prefixes for the number keys. i.e. if it’s A, I’ve used the PREFIX A, 1, Prefix 1, etc , etc.
Something changed in EASYEDA a couple of months ago which now means that Prefixes with a single digit number now all seem to tie their nets together.
Here’s the resulting PCB – Note, the nets for the centre pins are all the same!
I didn’t spot this in the one that I just had made! and despite the thoroughly heroic efforts of the JLCPCB staff to fix a couple of cockups i’d made , I have to now trash this batch .
Ah well, off to learn a little more about EASYEDA, quite an expensive mistake though, but this shows why, when you make changes, testing is important.
You can imagine how amused I was when I discovered that EVERY key worked on my board, except the number keys, which only typed 0 or 9 !
In other news – I purchased one of these
An Ultrasonic Cleaner – Dual Frequency 28KHz and 40KHz. I’ll do another post about it later.
All i can say now is WOW – No need for the wash and cure station now! – this thing superbly and consistently cleans the prints, giving a good surface finish. Prior to this, it was impossible to get a good finish on every key, every time. Now, i’m 4 prints in , and 3 are perfect, 1 is crap due to over-cleaning! I’m dialled in and ready for production
My previous choice of Micro was mainly driven by attempting economies of scale and using the same one for the C64 Mini keyboard kit as this. Also, a desire to allow people to ‘program up’ their own Blinkenator board – The Atmega32u4 is a bit of an overkill for a handful of LED’s though. Importantly also, prices of arduinos have risen quite a bit since Brexit . Changing to a chip saves easily 60% in hardware costs over the soldered on Arduino, it also saves a handful of minutes in soldering!
It does introduce a little more complexity – I now need to figure out how to ICSP – In Circuit Serial Programmin works as i’ll need to burn an Arduino bootloader to each one.
I’ll also need to develop (or modify) a Programmer to allow a more day-day use of the device over UART to USB
Next step, port the Blinkenator to the 328p, test, if it works, Order Beta11
Oh, the Ball clamps are working superbly, just gotta be careful of feature creep on that clampinator board now!
oh, probably will look at swapping the JST connector footprints to SMT – would be nice if I can have just the
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
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
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!
The final hurdle for ‘good enough’ for me now is the space bar.
Every key prints lovely, except the largest one……Take a look
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
Possibly. I’ve 3 types (all anycubic) and seeing the same on all 3
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
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
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
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