Bugs

Deeped rear side screw hole in main extruder printed piece so it can accept 18 mm, not 8 mm bolt.

Improvements

Priorities:

Simplify to monolithic parts instead of clamshells for the idler, motor, and carriage sides of Universal Axis
Include sensorless endstops
Collect data on lifetime and maintenance requirements
Document plotter, cnc drill, vinyl cutter, and laser cutter operations
3D print the bushings, belts, and pulleys
Design open source stepper motors
Design a CNC-millable version of the RAMPS board and Arduino Mega

Evolution:

Balanced X axis, where the carriage is attached to the Z axis, and the toolhead is mounted to the idler piece. This balances the motor side stepper with the idler side stepper (extruder).
Automated Toolchanger?