I don't know what to name it, I made this so that the screw hole can be customized rather than having to go with specific hole distance that can go with specific model/variant. The model are based on the vanilla prusa i3 by Josef Prusa scad script, I mixed this with a geeetech x carriage to have an extended arm to hit the endstop because on geeetech prusa i3 series they have these extended arm to hit the end stop that's mounted on the x motor block. Another reason was that geeetech uses LM8LUU bearing measured at around 45mm length and it is hard to find compared to the 25mm LM8UU bearing. Basically, the overall structure are vanilla only the bottom part has been widened a little bit to have the geeetech screws stays inside the belt straps Update 26th June 2015 The stl included here are base model that doesn't have screws. Download both stl and scad file or the zip file and extract both in same folder. There are variable called type there and if you want to add another variant mounting hole/presets, do let me know and I will update the scad file.