Designed to fit the Prusa I2 base size of 220mmx220mm. Supports 4 point and 3 point heated beds.BOM : M3 nuts and Bolts/Pozi Screws (Length depends on beth thickness) also some springsIf using 4 point system print 4 x 90 if using 3 point system print 2 x 90 and 1 x 180drill out the holes in the prints. (this is needed due for nut traps to print correctly)Printed parts go on the underside of the bottom bed and screwed in from the top.put items in place and either mark up drill hole points or just drill strait into the bed using the parts as a guide.Will hopefully have some better pictures up in a few days