A project log for UV projection printer for PCBs and item marking

This tool can project UV mask and cure paint on various objects, including PCB prototypes, 3D prints, panels and household items

wojciech-adalbert-jWojciech "adalbert" J 10/08/2023 at 23:110 Comments

The prototype is quite inexpensive:

396nm 5W UV LED $5
MT3608 Step-Up converter $2
1W 1Ohm resistor $0.1
USB or barrel jack connector
45x45x10mm heatsink
3D printed case~$2 (filament)

It should be possible to build such a device spending less than $15 (if you have your own 3D printer, however an improvised case made out of cardboard or other materials could also work).

There is an added cost for each print, because of the need of printing a transparency film for the exposure mask, but that shouldn't cost a lot.

The UV paint/soldermask is obviously also needed, but it is inexpensive and lasts for long. A 10ml container costs around $2-$5. There are various suppliers, i am using "Mechanic UV Solder Mask" which is available in various colors. Such paint is often available in stores which supply equipment for electronic repair shops, as it is often used to repair soldermask layers (but it is not used too much for actual printing!)