Samtron Monitor Frame

thingiverse

The little samtron monitors that come in cardboard frames could use a sturdier frame, so here it is. Designed to mount the PCB on the bottom, with openings for the adjustment knobs on the right side and an opening for a cdjump adapter board for arcade compatibility. The back is optional but it probably gives a bit more protection to the neck board. ### Disclaimer: Due to the length of the CRT tube as well as the PCB, the length of the models is 232.9mm. This may limit the printers capable of printing them. I believe it's too long to print on a stock ender 3, but I built and installed marlin firmware with the printable area enlarged to go to the extreme edges of the print bed. In fact, without my glass sheet precisely placed, the print would've gone off the edge. I also had to tweak the printer settings in cura to allow printing all the way to the edges of the bed. ### Required hardware: * 4 8x32 3/8" machine screws for the back corners * 4 6x32 1/4" machine screws for the PCB (you can use longer, but they'll extend out of the bottom) * 4 1/4x20 1/2" screws to mount the CRT * 4 1/4x20 nuts ### Assembly notes: * I recommend using a tap and die set for prepping the PCB and back corner screw holes. Without this, you could either try to let the screws self tap into the holes or enlarge the holes and use nuts (YMMV). Tap your threads carefully though - since it's plastic, it's really easy to trash the threads while tapping or even while tightening the screws! * I found the PCB mounting holes to not be very square, so they don't line up with the frame as ideally as one would like. You could enlarge the PCB holes as needed, but what worked for me was to have a gap between the PCB and the frame while screwing the screws in, and keeping the screws loose until all 4 were mostly in. * Not strictly necessary but I found a little hot glue on the midpoints of the 4 front-to-back edges to help hold things together a little nicer. * Rubber feet would be a nice addition on the bottom. * I found 6-32 1/4" screws at Home Depot but not all stores carry them. If you get 3/8", in order to avoid the ends sticking out on the bottom you'll need to either add some sort of spacer, add rubber feet, or dremel the screws shorter. * For mounting the CRT, I used a socket with a long extension to hold the nuts while screwing in from the front. Alternatively you could screw in from the back with a long screw driver and have the nuts on the front.