I keep my filament on an old curtain rod over a shelf, and the rolls that are far away from the printer don’t unroll correctly. This shelf clip fixes the problem. The open loop design allows it to open a bit to fit over the shelf with a small dot of poster-tack-gum underneath to keep it from sliding to the side. Made in Tinkercad.
STL file: http://www.geekhaus.com/makerhome/day106_filamentshelfclip.stl
Tinkercad link: https://tinkercad.com/things/byqokD7ZUIX-day-106-shelf-clip-fliament-guide
Thingiverse link: http://www.thingiverse.com/thing:203978
Settings: MakerWare .3mm/low on a Replicator 2 in 20 minutes.
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