Sisyphus Auto-Rewind Spool Holder

thingiverse

Filament load/unload problems? MMU2 taking up too much space? Not with this Sisyphus Auto-Rewind spool holder! It keeps filament on the spool during unloading, up to almost three full revolutions. To install it, use two curved nuts to attach the spool to the roller. Place the roller on a stand and insert filament into the extruder/MMU2. That's all! You can also install a filament tube from the extruder/MMU2 to the frame in two ways: above (using a tube holder) or below the spool. The slope of the track can be adjusted by placing objects under the frame and/or by screwing two M3 bolts into designated holes in the frames. This has a direct impact on the rewinding torque. This design is inspired by gravity-based spool rewinders, but with a unique twist. Instead of lifting an external weight, Sisyphus lifts the whole spool by rolling it up an incline. Like all gravity-based rewinders, Sisyphus makes a clicking sound when it reaches the end of the track. This noise can be dampened using rubber feet under the stand or eliminated altogether with the clutch mod. Sisyphus, or Sisyphos in Ancient Greek, was the name of a mischievous king who provoked the wrath of the gods. Among other things, he betrayed Death himself and imprisoned him when he had the chance. Eventually, he was punished by the gods and placed in the Underworld, where he was forced to roll a giant spool up a steep hill that would always roll back, repeating itself until eternity. Check out this video for a demonstration of Sisyphus in action! Multi-material GCode is available here: [link] Single-material GCode is available here: [link] Other gravity-based rewinders and community mods include: Circular Gravity-based Auto-Rewind Spool Holder Linear Gravity-based Auto-Rewind Spool Holder Prusa i3 top mount roller-style gravity rewinder Sisyphus Clutch Mod (Recommended!) Cormer Mounting Clip (For Lack enclosure) Gravity Rewinder Adapter Central Mounting Clip Changelog: July 12, 2019: First version (v4.0) released Aug 4, 2019: Discovered that an older file of the frame STL was originally uploaded. Frame_v4.0a.STL is the same version as in the zip file and is more reliable than the older one.