Rod Clamp
thingiverse
Clips a 10mm rod on to a square 22mm frame. Used with an old printer head guide rod and a steel frame fireplace wood bin to form the hub & frame of my filament spools with http://www.thingiverse.com/thing:4337. Includes a slot & fitting "U" spring clip to keep the rod in place on one end, since the rod was nicely slotted like that. Instructions Print them, insert a rod, insert the retainer clip if desired. Clip the assembly on a square-tubed frame.
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