Someone on facebook suggested that the stock wanhao Firmware doesn’t handle leveling propertly. They’re right
given the 1000’s of people having issues getting the D9 to print properly, there does seem to be something fundamentally wrong with the printer….
In your Cura / startup script, find G28
now make it look like this
Now your printer should reliably print first time every time
G28 in the 1.14 version that Wanhao uses DELETES the leveling mesh from Memory!
or, in other words, every time you ‘home’, you un-level the bed!
Adding M420 S1 restores the mesh to memory
Stupid Wanhao 😦
I can confirm after doing this, my printer for the first time in memory has printed an OK first layer three times in a row without me having to do anything!