About this 3D model

Uses SAE bolts. 5/16" and #6. Faster to print, uses less material. No observable change in accuracy. Gravity and the weight of the gantry keep it from back-lashing. Should be noted I am using brass oilite bushings instead of the printed ones. Only one each side. Carriage mounts Wade's or Greg's extruders. Other items I'm using; http://www.thingiverse.com/thing:12151 http://www.thingiverse.com/thing:5995 http://www.thingiverse.com/thing:8917 http://www.thingiverse.com/thing:4773