Simple Filament Spool Dryer

Simple Spool Dryer
Copyright 2025 by Anthony W. Hursh (pulpgrinder on Makerworld and Thingiverse)

Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license.

You are welcome to make these items for your own use (or for a friend) but you are not permitted to manufacture them for sale. Nor are you allowed to remove the attribution. Remixing is permitted, as long as the same terms are applied to the remix.

This is a simple spool dryer for 3D printer filament. The only external component used is a humidity meter (hygrometer), and even that can be dispensed with if you so choose.

Background

As you probably know, certain kinds of 3D printer filament are prone to absorbing moisture from the air. This causes problems when the wet filament goes through the printer hot end and turns to steam, producing bubbles in the extruded plastic.

There are many solutions to this problem, but most of them cost a fair amount of money, particularly if you only print the troublesome f