PLA. Works and fits fine. Nice design.
Nice make and thanks for sharing. I'm curious to know why your power supply sits higher than mine? Do you have an Anet A8? What is the other on/off switch for? What is the size of the circle? Maybe I can create an opening on the back side for you. Or easier and not to waste plastic, you could drill the hole too.
I drilled new holes in my frame to make the power supply sit up higher. The other on/off switch is for my LED lighting. My power supply is a model LIHUA 12v 30 amp supply. The extra switch needs a 3/8" hole but I'm not sure if there's room for it. I was going to move the switch up higher near the LEDs. The mounting holes from your print to the power supply fit great. I didn't have to make any adjustments at all and it bolted right on.