This is also another customizable screw hole but based on geeetech x-carriage design because the difference between vanilla or the rest of the design and geeetech; geeetech uss a 45mm lm8uu while most 3d printer uses 25mm lm8uu. Unless you want to use this with a printable bushing can be found here which is nice, might be a good idea (I never tried these bushings yet) http://www.thingiverse.com/thing:91389 This item is for those who are using geeetech 45mm lm8uu but with the ability to change the screw hole profile without the need to change the lm8uu just because the other x-carriage uses better or different screw hole profile. The belt slit also improved to have slightly wider slit for easy insertion, slanted slit opening as well as flat teeth at the bottom part where the belt supposed to be looped around the screw holes However, the part are not tested by me yet especially the belt slit on the loop area in between the edge of each sides (where every geeetech owner would have problem inserting belt there)Either download the stl parts or the zip zip file contain stock geeetech x carriage, script and another 2 finished stl. The scad script needs geeetech stock file in order for you to render the finished product Type