These are special drills made for drilling plastic. The steep angled points work much better than standard drill bits. Printed in PLA with a 0.6mm nozzle solid. You may have to use the drills to ream out the upper holes for them to slide into. This was done on purpose so they wouldn't be falling out.

These drills were bought individually from TAP Plastics, but the same drill bits can be purchased on Amazon.

Sizes are 1/8", 5/32", 3/16, 1/4", 5/16", 3/8", 7/16", 1/2".