2020 Filament Guide

This is a funneled 1.75mm filament guide that bolts on to a 2020 aluminum extrusion, using an M4 screw and square nut. Filament can be guided either parallel to the extrusion bar or perpendicular to it. It's inspired by [walter's](https://www.thingiverse.com/walter/about) [Filament Guide Block](https://www.thingiverse.com/thing:866950).

The OpenSCAD source file is provided, and all parameters are customizable.