Fully printable rewinder for Filament Storage 2026 plus other improvements.

Introduction

I love this design. It's great, but I had some issues I needed to address. Thank you to GunplaMark for making my life easy by publishing the STEP files.

I've made a number of changes from the original design:

1. The original rewinders require a non printable metal spring and are (IMHO) over engineered. Having had past experience with VincentGroenhuis's rewinder, I knew it worked well. Testing confirmed that it works perfectly in this scenario, including with an MMU3. Also it only uses 2x608 bearings per rewinder instead of 4.

2. The VincentGroenhuis rewinder has been modded to add a removable end cap which prevents the spool falling off and allows you to change the spool without dismantling the whole rewinder. Also modded to take a hex profile shaft.

3. Getting the shaft inserted into the side supports while mounting the spool is a huge pain in the ass. To resolve this, I've added a guide channel to the side support and changed the profile of the shaft to be hexagonal. This gives you rotational symmetry which needs at the most a rotation of 30 degrees to find a fit.

4. The original clip on the shaft falls off if you look at it funny. Just getting the whole rewinder out of the supports would cause it to fall off and then the whole thing falls to pieces. I've replaced it with a printable split pin instead. I tried to test it to destruction but I was unable to break it.

5. Desiccant bin clips are fragile AF and don't print cleanly due to a 90 degree overhang. Broke a few of them and printed some repair patches before I modified the design to be stronger.

6. Latches: I've used a similar design to SaDiablo which makes them easily replaceable and hinged on a rod. I sized it for a 1/8" thick rod which can be found cheaply at most big box stores. If people want other diameters for other hinge options, let me know and it's easy to make a new version and upload. They need to be cut to 55mm lengths.

7. NEW March 2026: Added another version of the main body and latch to allow the use of filament as a hinge. I haven't personally tried it, but it works well according to this remix. You might want to grab that improved latch as well, while you're there.

8. As above, I've used the same technique as SaDiablo  to enable the use of the original gasket from the containers. 

9. I used a slightly modified version of the desiccant container from this remix.

Printing

• All parts are aligned in the STL to print optimally.

• Main body: I recommend printing with a 0.6 nozzle and a .32 layer height if you can, just to reduce the print time a bit. I put in a height modification from 1.2 to 5.4 and set the layer height to 0.2 to get nicer definition on the latch holes.

• Latches: Print standing up for best strength. Depending on your hinge choice, you might need to clean up the insides with a round file.

• Axle and Split Pin: Recommend printing in PETG with a 0.2 layer height. 3 perimeters.

• Side supports (Left and Right): Must be printed at 0.2 layer height to get a relatively clean bridge for the axle guide. Recommend setting your bridging speed to 15mm/s for best quality.

• Desiccant holder: No special instructions. Print however you want.

• Rewinder: PLA is fine. 0.2 layer height. No supports needed.

Assembly

• Rewinder: Follow the original guidelines. It's not complicated. Push the axle in from either end. Doesn't matter. We'll align the rewinder when installing into the side supports. Use the split pin on the other end to hold it in place.

• Main body: Insert the gasket from the original container. I recommend something like this  to make it easier.

• When putting the spool on the rewinder, make sure the spool unwinds in the direction of the arrows on either end.

• The spool does not need to be gripped by the end caps. In fact, that would be problematic if it were. If you hold the ends of the rewinder, it should be possible to rotate the spool. The friction there should be enough to tension the rewinder and will then slip when the rewinder is at max tension.

• After putting a spool on the rewinder, the end cap snaps on. There's an arrow on one side. Hook the opposite side on to the end of the rewinder and then push it down. It's very tight. It needs a lot of force to begin with. I recommend doing it 3 or 4 times to loosen it up a bit before putting a spool on, because it's harder with the spool in place. The arrow tells you where to pull to remove it later.

The rewinder doesn't have a clutch mechanism, instead relying on friction. I have found this to be very reliable even with plastic, cardboard, full or nearly empty spools.

If you have requests, questions or suggestions, hit me up in the comments.