Open-hanging spool-holder
thingiverse
This desired spool should possess several features: open on one side for easy filament change; positioned parallel to the x-axis for direct filament movement; hanging from the top like the previous model (http://www.thingiverse.com/thing:3962); and simple to mount/dismount during reprap transportation, preferably with flat transportability. The current testing shows satisfactory results. To assemble, download the design, cut it, attach a bolt, washer, 608 bearing, another washer, and nut. Tighten the nut sufficiently for locking but not too much to hinder spool rotation. Position the spool spacer at the necessary distance for filament holding (possibly glue them), and finally, place it at the top of your reprap for optimal functioning.
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