So my biggest hope for my 2.5W laser was to use it to apply soldermask and silkscreens to PCBs. From my research 2.5W was a major overkill, but I figured I could adjust it down.
Well, partly wrong. I have however attached another lower power laser to the machine and made some test exposures. Not sure where the artifacts i'm seeing come from though.
Just for a sample i used the first open source pcb hit in google image search, and made a couple of exposures at different feed rates. Took a while before I noticed that LaserWeb3 had feeds in mm/s instead of mm/min though.. Do take the mW written with a might big pinch of salt, its loosely based on guestimates from PWM driving a non-TTL driver.
Attached is the result, there is probably some parallax issues, and even spreading of the paint seems be an issue on the 2nd row. But my main concern is the S shaped lines along the X axis. And lets ignore that the picture is intended for the copper traces and not the silkscreen, its just a sample with fine-ish details.
Anyone else have experience with what work better for this type of UV paint? Higher feed, lower power, more passes?