PLEASE NOTE - these pins are just a “temp replacement” of M3 screws needed for assembly and will only withstand a light use. Probably ok for a box of thumb drives or similar..

Print settings:

• Use Brim
• 15% infill is ok for light use (they end up being hollow with a tiny hole in the center) or you can increase it to have a solid pin
• Probably print one extra in case one of them snaps

Installation:

I slightly sanded the sharp edge on one side to make it easier for the pin to be pushed in. Then use some hard plastic to push it in from outer → inner side (the inner hole opening is smaller; it's meant for the screw's threading).