Scrolling Desktop Scratch Paper Dispenser

This is a fully 3D-printed “perpetual scratch paper system” It's mounted to the underside of my desk and provides a continuous surface for scribbling and sketching. Whenever I need a clean spot to write, I just reach down and turn the crank. New paper unspools and slides up across the desktop, while the used paper feeds down and wraps neatly onto the take-up roll below. (paper can be run forwards and backwards)

Mechanism in action: https://imgur.com/a/scrolling-desktop-scratch-paper-4DYgpSG

Base plate mounted with 4 recessed screws each, the rest of the assembly slots in via dovetail connections. The mechanism locks in place with four printed thumb screws

Designed to fit 1 inch diameter tubes of kraft paper rolls, but could be adapted to fit other tube diameters, and lengths. 

Printing:

• Nozzle size: 0.4 mm
• Layer height: 0.2mm 
• Supports recommended 

Parts List: (For full mechanism)

1. Mounting bracket (Ratchet side) 2x
2. Mounting bracket (Blank side) 2x
3. Mounting plate (threaded) x4
4. Tube gripper x4
5. Ratchet tooth x2
6. Torsion Spring x2
7. Spring cap x2
8. Base lock screw x4
9. Tooth lock knob x2
10. Hand crank x2
11. Hand crank ball x2
12. Retaining ring x2
13. Empty spool A x2
14. Empty spool B x1