PLA + Will require 4 Plastite Screws (Size 4-20 1/2"), should have quiet a few left from the kit. Recommend installing screws into printed foot bar, prior to installing on the Smalls. Fit is snug, but works great. Doesn't interfere with any of the other holes. I print everything pretty solid for strength, use your own settings. Mine were: Temp 210C Bed Temp 60C Recommend printing logo up, with supports. Infill 50% Fast Honeycomb (I am sure it is overkill; what worked for you? Share in comments)