Geared Spring Alignment Hammer - for filament spool auto rewinders
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A small tool to help align and insert the geared spring that is used in some filament spool auto rewinders.
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Model information
- Source
- Printables
- Category
- Accessories
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
This is a very simple (and almost undoubtedly overbuilt) tool for aligning the geared springs included in many filament auto-rewind systems.
The measurements and sizing for the tool were explicitly based on this model but are likely to work for most related designs:
https://www.printables.com/model/702217-mmu3-mmu2s-5-spools-auto-rewinder-adapter-for-unor
I was having trouble aligning and inserting the geared springs for my auto rewinder, so I made this simple tool to help insert them level (holding the case, so I was inserting from the bottom) and applying some even pressure.
MAKERS: Please post a picture with comments here of any prints/makes you do from this model so that I can see how people are using it and whether you are finding success with it. Thanks!


Should also work with:
- https://www.thingiverse.com/thing:3781815
- https://www.printables.com/model/269390-integrated-auto-rewinder-for-spool-tank
- https://www.printables.com/model/18578-integrated-auto-rewinder-spool-holder-for-repbox
and likely many other similar designs.