Version History

Release: 8 August 2025

Version A5 is reworked from the ground up, incorporating tons of exciting features boosting its performance. Here are the main features in a nutshell:

• No spool slip without the risk of spools falling of (new mini-roller at the front)
• Over 50% increased rewind length
• Better rewind strength, eliminating stuck spools.
• Improved PTFE-routing.

Mini-roller

The biggest change is the incorporation of the third, smaller roller at the front of each module. This roller vastly improves the performance of the Rewindr. Here is how the mechanism now works:

1. The spools turns the front-roller as usual, slowly raising the Arm-assembly upwards together with the spool.
2. When the spool is almost raised to the maximum height, it starts to touch the new “mini-roller”, turning it.
3. More pressure gets put on the mini-roller when the spool is further raised, and less on the Front-roller. 
4. Finally, there is not enough friction to turn the front-roller and the spool slips on the roller surface, effectively working as a clutch limiting the windup. 

The mini-roller ensures that the spool will slip at the top regardless of difference in spool-to-roller friction. This means that you can run cardboard spools on high friction TPU-sleeves, without the worry of them not properly slipping in the topmost position 

Gears

The gears in the mechanism have been completely reworked, with emphasis on efficiency. With the combination of improved efficiency and a lower gear ratio, the A5 version removes the problem of spools getting stuck in the top position. The higher efficiency partly comes from higher dimensional accuracy, a result of the gear teeth being larger and thus easier to print.

I have also put a lot of time in to the gears allowing for a larger rewind length, balancing rewind strength and rewind length. The new A5 version has a 55% increased rewind length compared to previous versions. 

PTFE-Routing

The PTFE-routing underneath the modules was pretty good before, but not perfect. I wanted to improve the routing in anticipation of the CORE One setup, making it possible to route all PTFE-tubes to the central module. This makes it easier to then route the tubes together straight towards the MMU3. This is especially important for the CORE One, where routing space will be limited on top of the CORE One.

Routing is now easier then ever, where the PTFE-tube can follow smooth channels on the bottom of the Rewindr.

Other things!

There will be no 685 and 686 versions of the Rewindr, both bearings will be compatible with the same A5 parts. All bearing pins and holes are double stacked, so any bearing will fit. This of course simplifies things.

The R- and L-Arm are now providing more support all around the back-roller, making the assembly more sturdy. The “lever-rack” (formerly “ring-gear”) is now secured with one of the screws used to attach the R- and L-Arm to each other, making it simpler.

The whole assembly uses 40 less screws than previous versions. There is no longer any need for screws in the bearing pins, making assembly much faster. The new pins are very simple, won't break at all, and are much more reliable. 

The PTFE-guide is much more securely held in place on version A5.