This is an alternative carriage for a Eustathios Spider 2 3D printer that uses m8 linear bearings instead of bushings. This can reduce friction, cost, and wait for parts. But the original carriage works fine too. Note that this carriage was reduced from the stl of the original in Blender since there were not Blender compatible files available, so has some backward polygons but prints fine. This is the version with supports already in the model. I was able to trim a few millimeters off the original carriage to gain a little extra printing space.