Dry Box with Integral Rewinder

thingiverse

The main goal of this design is to create a moisture-free storage container for spools of filaments that can be easily selected by Prusa's MMU2 accessory. This design combines and modifies two existing designs: * **Integrated Auto-Rewind Spool Holder** by VincentGroenhuis * **Filament Spool Stand for Rubbermaid Container** by MysteryDough The containers sit on top of an enclosure, such as the one referenced below, and feed filament into a PTFE tube that connects to one of the MMU2 input ports. The filament container or **Dry Box** contains packets of desiccant that absorb any humidity that enters the container. Except for a short piece of filament within the MMU2 feeder, no part of the filament is exposed to the surrounding atmosphere. Also incorporated in this design is the **Integral Auto Rewind** mechanism, which applies rotational pressure in the opposite direction of unspooling motion. This re-spools the extra filament that is returned to the container upon Prusa i3 MMU2 filament Unload or Eject. An OpenSCAD file has been included in the file section, allowing users to generate rewinders of different sizes. As a matter of convenience, all the parts necessary to assemble an 87mm wide spool are included in the file section of this design. **Important Note:** It is crucial that the unspooling motion tightens the Springs and does not loosen them, as the latter will break one or more of the Springs. To achieve this, the Cap must be placed on the left side (looking forward with the PTFE tube closest to the observer) of the spool for filaments unspooled from the top of the spool. Typical Enclosure: https://www.thingiverse.com/thing:2396990