Eco3D Filament Spool Hole Reduction for original PRUSA i3 Printer

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I started experimenting with filaments from a new source, http://www.eco3dfilament.com. I also wanted to optimize the reduction for the spools themselves. So I revised my original Prusa filament spool reduction. Reduction_ECO_big_hole.stl is designed for 0.25kg filament spools. Reduction_ECO_small_hole.stl is created for 1 kg filament spools. By the way, take a look at them if you want. They produce high-quality filaments. While I was working on it, I added a universal Scad file for your convenience. Just edit three basic variables and create your own custom size spool reduction. The variables are: Diameter of the spool hole. Width of the rim in the spool hole. Diameter of the spindle of the spool holder. That's it.