I present the Ultimate Filament Spool Roller

Modular - Customisable - Designed to work with 3D Printed 608 Bearings

I designed this roller to fit my dry box project, as it can be extended as many times as you like. Alternatively, you can simply print it with the two end frames to have a single roller.

The roller bearings are 3D printed and work very well. I designed the frame to work with the printed 608 Roller Bearings by Tassesin (https://makerworld.com/en/models/473167#profileId-383170). Adding a little machine oil to the bearings makes them spin beautifully.

Centre Locking Brackets:

• Hexagon-shaped lock, designed to fit snugly but allow the brackets to be printed without supports
• Solid bracket for a simple lock.
• The second bracket has 2x M6 holes, 30mm apart, to allow securing of the roller to a surface or dry box.

Print Settings:

• Everything prints nicely at a standard 0.2mm layer height. Supports are only needed on the center bi-directional frame, as printing it standing up will result in tolerance issues with the axle for the roller bearing. 
• 15% Gyroid Infill

Desiccant Boxes

I encountered an issue while constructing my dry boxes: the bottom surface isn't perfectly flat, which reduces the available surface area for placing rollers. Instead of merely adding supports, I had the idea of doubling up the supports as desiccant  boxes. The outcome is my somewhat imperfectly designed desiccant box solution.

I understand that this solution may not be suitable for everyone, but I am including the print files in case you find it useful. Additionally, I've included a funnel to facilitate filling the boxes more easily.