Simple easy-to-use space-saving MMU2 hanging spool system

thingiverse

Update 9/7/19: I fixed the M6 version of ACB. I had wrong thread pitch. I don't have much room on my small desk for MMU2 setup, and while I found the filament wallet reliable, it's painful to manually change filaments. I looked at other systems and they are often complex and can fail/wear out. The printed hangers can break or add too much friction for my liking. There are some very nice, very clever systems out there, but I like simple and easy to use. I know this will not appeal to everyone. Note that this system is two solutions: simple cheap spool hangers for getting spools off your desk to save space, and very simple filament feed/retraction management (ACB) for MMU. They are separable. You can use one and not the other and combine with other solutions. **What I like:** Super easy to slide new filament spool onto hanger; holds all sizes 1kg and smaller Super easy to manually insert new filament to MMU by just shoving into ACB funnel. Super easy to manually remove filament by holding ACB and turning spool to wind up ACB uses simple and reliable return spring: gravity (hasn't failed me yet) and doesn't tangle Fun to watch ACB rising and falling **Parts needed:** 1x straight 1 1/8" wood utility handle (I found at Home Depot as TrueTemper 2700100) 5x Everbilt rafter hanger (slit vinyl coating with razor and pull off) 5x PC4-M6 PTFE coupler - make sure to get "coupler" with 4mm bore to pass thru **OR** 5x (or 10x) PC4-M10 PTFE fittings Optional: high translucent 2.5mm ID PTFE for lower friction and better visibility **Print:** 2x wall brackets: 0.2 layer 5x hanger mounts: 0.2 layer, 3 perimeter, gyroid 5x anti-climb bells (ACB): 0.15 layer; recommend light color for writing on with permanent marker ###Assembly Screw each wall bracket into a wall stud, 16" apart. Cut taper end off handle and to desired length (~40") and clip into wall brackets. *Optional:* screw into handle from behind to hold in place. Insert one M3 hex nut OR square nut into nut slot on mount and thread in M3x12 to catch. Clip one hanger into each mount and tighten screw to more or less level (not that critical). Snap onto handle and space apart from each other some. Screw one PC4-M10 snuggly into each ACB and push through PTFE. Write filament channel number onto flats of ACB. Hold PTFE and rotate ACB so long axis more or less parallel to wall (not that critical). *Optional:* taper PTFE inlet a touch if using std 2mm ID. *Optional:* instead use high translucency 2.5mm ID PTFE *Optional:* use additional 5 PC4-M10 to attach PTFE to MMU using a mod such as passthru adapter. *Optional:* screw 5" deep plank on top of wall bracket for small storage shelf. When mounting spool, have it unwind toward wall. Also, there is a small hole in mount where you can stick in the end of filament to hold for you as a convenience.