I’ve had all the pieces except the 1N5404 for a few weeks (of course there has to always be that one seemingly lost package that the seller wants you to wait the full 30 days when you order a bunch from different overseas sellers). I was thinking of just paying the 7X as much for a $7 5 pack on Amazon to finally be able to put things together.
There shouldn’t be any problem with using a 3pin Dupont connector, leaving the middle connector empty to just use D4 and GND, and connecting it across D4-5V-Ground on the servo block right? Then a JST-XH 2.5mm pin connector on the other end of the cable to TTL. If the laser has it’s own separate power supply that is not plugged in then it can’t turn on when RAMPS powers up, right?