CR-10/Ender 3 Filament Spool Holder
thingiverse
This is a spool that will attach to 20 by 20 aluminum extrusion. I made it for my CR-10 mini, but it will work on the CR-10, Ender 3, or any printer with a top gantry made of 20 by 20 aluminum extrusion. In order to attach it you will need 4 M3 hammer nuts, and 4 M3 X 14 or larger bolts. M3 X 12 may have sufficient reach, but it will be tight. If your bolt is too long, use washers. I recommend that you print the model on its side. with both the square section and the round flange touching the build plate.
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