My original spool broke, so I modeled another and thought others might need one too. This is for the Patterson Tank System 4, NOT the super system (I have not tried it, so it may or may not work). Specifically, the tank that can take 2 spools of 35 or one of 127/120. Made in Sketchup.

Printed in ABS with 100% infill, black filament. It's a basic design but has been light tight and has worked flawlessly through 10 rolls of film in black and white and color chemistry so far. Hope it helps you out!