Z Axis Guide

I didn't have a lot of luck with the cantilever Z axis on the D-Bot printer. Here is a design that positions the guide wheels between the side supports and has a wider spread on them. The installation only requires that the beam be square to the upright and a slight amount of pressure against the supports by all four wheels.

This setup is rock solid and the stepper motor now mounts in the middle of the support. There is also a spacer included for this setup so that the stepper and lead nut mount in the same plane. You will need 5Mx16 screws to attach the spacer and the nut holder.

Be careful not to overtighten the bolts that capture the wheels. Only a small amount of pressure is needed to keep the inner race from turning.

I haven't worked out the homing switch because I'm using a sensor.

The end supports use the cantilever arms. Two new pieces will be needed across the ends to support the bed. If the stepper cross mount from the bottom is used as one of them then o