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Descrição
This is a resizable bushing to hold your spool onto a smaller smooth rod. It is basically a clone of ctheroux's 'Simple Spool Bushing V2' but made adjustable to fit whatever size spool or rod you're using. Simply slide one in each side and hold with two rubber bands (or zip ties, etc).
I use it with antslake's 'Spool holder for makerfarm prusa i3' on my MakerFarm i3v with an 8mm rod from a local hardware store.
The example STLs fit the spools I got from MakerFarm as well as two sizes I got from Octave.
Simple Spool Bushing V2 by ctheroux:
http://www.thingiverse.com/thing:216083
Spool holder for makerfarm prusa i3 by antslake:
http://www.thingiverse.com/thing:192510
Instruções
Open up the .scad file in openscad (free!), then input the diameter of your spool's hole and the diameter of your smooth rod. Export it to an STL for printing. There are a few more parameters you can adjust if you like.
I used ABS with 30% infill and they are more than strong enough.
