Hanging Spool Holder V3

A revision of the original holder, very slightly beefed up on the top and side to reduce gradual bending seen in some holders in use. I actually made an include a clip to hold thinner spools closer to the inner arm, which lessens play of the spool and lessens the bending force exerted.

Has the same mounting points as the last revision and the same (slightly enlarged) PTFE tube holes, so you can just print this one and swap it in directly if you're upgrading.