Dremel 3d20 (Idea Builder) Spool Holder

Remixed from the [Flashforge Spool Holder](https://www.myminifactory.com/object/3d-print-flashforge-inventor-spool-holder-30028) by @toolman207 and the [Filament Spool Holder & Adapters](https://www.thingiverse.com/thing:792929) by @malakath


This provides a sturdy 'finished' look for a spool holder on the 3d20 Idea Builder, allowing the lid to be kept on, and oversized spools to be switched in and out easily. Modification causes no damage, and does not require any disassembly of the printer in order to put into place.


Trimmed the sides of the original plate down by 2mm each to fit the 140x120mm opening on the Dremel 3d20, as well as replaced the wingnut with a twist in place friction lock, that doesn't require the bolts and glue. Filament guide has been tapered to make the filament slide in easier, and put a slight cut out on the back plate to allow the filament to move with less friction. Only the left side is built, since the 3d20 is a single extruder with its built in