Core-XY Doodler

This is my first attempt at a Core-XY 2D plotter, focusing on simplicity and low part count.

See it in action: https://www.youtube.com/watch?v=m_Via52Ep7E

Print:
- 2x: motor_mount
- 2x: rod_support (mirror one)
- 2x: y_carriage
- 1x: x_carriage
- 1x: motor_offset
- 8x: belt_guide (I used TPU for this)

Parts:
- 2x: NEMA 17 stepper motors
- 4x: 8mm linear rod
- 6x: 8mm linear bearings
- 2x: GT2 pulleys
- ~2m: GT2 timing belt
- 8x: 22mm skate bearings
- 1x: Something to mount it to (I used .25" MDF)
- Various screws, zip-ties

I used a RAMPS 1.4 board running Marlin firmware to drive the motors.