Air-buffer for Prusa Enclosure V2 - MMU3

My requirements:

• simple workflow to load/unload filament
• possibility to manually push/pull the filaments to fix failed loads/unloads (yes it happens)
• weights guided during printing (and always tidy and at hand when unused)
• weights can be installed/uninstalled while filament is loaded
• whole setup attached to the enclosure (and therefore movable with it)
• quick and tool free disassembly of the printer
• reliable… hopefully

All parts printed in PETG except end-caps in TPU.

Needed furniture

Spool holders

• 24mmx24mm aluminum profiles for the spool holders main supports
  • parts are provided for what I had in stock: 23.7mmx23.7mm square
  • scale on X and Y to fit your exact dimensions
• x10 6001 bearings: 
  • inner diameter: 12mm
  • outer diameter: 28mm
  • width: 8mm
• M12 threaded rods as axles
• M12 washers, nuts and nyloc nuts for the spool holders assembly

PTFE tubes guides

• 10mmx1mm aluminum tubes
• x20 M4x5.7x4.6 threaded inserts
• M4x40 hexagonal bolts if you use the provided long-neck printed knobs
• otherwise any M4x20 bolts

Weights

• in case you want to use the weights guides:
  • any ~4mm metal rods and build a hook out of them 
  • or as I did, hooks used for plaster ceiling suspensions (see photo
• otherwise any kind of weight should do the job

• replaced the original spool holders with a bearing flavor.
• added a set of PTFE tubes holders
• set of simple weight guides