This original design is really great. Unfortunately my build space was limited and couldn't do it in one shot. I tweaked it down a bit to print in 2 halves plus a clamp thing in back to keep it secure. I printed it on the Ender-2 with supports and used 3 random screws I had in my drawer. Sorry I'm not sure on the screw info but the holes are 3.5mm. Thanks to https://www.thingiverse.com/Suou/about for their design!