Simple spool roller suitable for hopefully all spools up to 1kg.

Wheels have a V-shaped groove to both keep them moving with the spool and keep the spool centered in them. They are also designed to be print in place, give them a few hits to start them moving. Print profile has random seams for better “unstickability” of print in place bearings.

Stand has compliant holes and pegs, they should fit together (from my build and testing) and hold. If that will not happen to you, I suggest using a drop of superglue.

Spacers are optional, but using them will guarantee a good placement of the spool every time inside tight spaces of the dry box.

I personally recommend using PLA for the Stand and Spacers while using PETG for the Wheels. But from my testing, PLA Wheels also work well enough, so you can also use PLA for the whole print.

Simple Dry Box Inlet:
https://makerworld.com/en/models/501070#profileId-416128
inlet on the third picture is my old custom one, new design in the link

Collection of My Accessories for 3D Printers:
https://makerworld.com/@golub17/collections/1575941

Notes:
Compared to the old model https://makerworld.com/en/models/155432#profileId-170131 there have been following upgrades:
- braces on the front of holder to brace against the drybox wall
- better and bigger wheels with better tolerances
- optional spacer to fix the roller for 1kg sized spools