Filament load/unload issues? MMU2 taking too much space? Not with this Universal Auto-Rewind spool holder! It keeps filament on the spool during unloading, up to
...Show more four full revolutions.
This is a remake of the Original and Parametric Auto-Rewind Spool Holder, but with significant enhancements:
* Slipping point of the clutch can be adjusted in 18 steps using the dial.
* One size fits almost all spools up to 1kg. Inner diameter 30-75 mm, max outer diameter 200 mm, max width 88 mm. Hubs for wider spools can be created with the customizer, same for hubs with narrow diameters. Stand for 3kg spools available [here](https://www.thingiverse.com/thing:3369189).
* Spring (v1 and v1.01) works both ways around: towards the axle and towards the outer rim. Note: flipping the direction requires re-calibration of the clutch tension!
* Spring v1.02+ is direction independent, can be flipped around without changes in clutch tension. This version is also better protected against spring overloading.
GCode for Prusa i3 MK2/S and MK3 /MM can be downloaded [here](http://www.vincentgroenhuis.nl/projects/universalautorewinder/).
The MM version uses two colors for most parts (three for the stand). First color is the base color (silver grey), second color is for decals and markers (vibrant color), third color is for the characters on the stand (white). The parts are designed such that missing layers in the 2nd and 3rd color do not affect the structural strength of all parts, also the number of color changes is kept to a minimum.
Two spring styles are available: SpringFlat is to be used with a 3-D printed axle with flat side. SpringRound is used with a round axle (e.g. metal rod). SpringRound has an anti-rotation block which aligns with the frame, so it is not needed to immobilize the round axle.
The spring may take a long time (>5 min) to slice in Slic3r PE 1.41.2. This is caused by the 1.1 mm thick spring blade which apparently slows down generation of perimeters. Please be patient and it is also wise to set all print settings right before importing the spring.
Hub thread length can be customized with the [Parametric](https://www.thingiverse.com/thing:3252111) Auto-Rewind Spool Holder customizer. Use output="hub", hubThreaded="yes", set hubThreadLength to the desired length and leave all other parameters at its default settings.
At Robotics and Mechatronics (RaM), University of Twente some research is done on variable stiffness actuators. Certain mechanisms in this Auto-Rewind Spool Holder were (loosely) inspired by our research there. One side of the stand reads "It's Rewind Time" while the other side reads "University of Twente". A stand with no text (blank) is also available.
A list of (mostly) compatible stands are on the [Parametric](https://www.thingiverse.com/thing:3252111) Auto-Rewind Spool Holder page.
Additional stands and other mods designed specifically for this Universal Auto-Rewinder by the awesome community:
[Prusa i3 MK3 t
