Compression-fit Spool Bushing v2
thingiverse
This compression-fit bushing is designed for attaching a spool to a mount/holder, compatible with Ultimaker and ProtoParadigm spools. The 8mm hole accommodates a smooth rod for connecting to holders like this: http://www.thingiverse.com/thing:20663. Print one or two (for better stability) and apply force for insertion into the spool.
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