Remixed from the Flashforge Spool Holder by @toolman207
Trimmed the sides down by 2mm each, as well as replaced the wingnut with a twist in place friction lock, that doesnt 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 feeding tube designed for the left side. As with the original print, the plates are held together with M3x15mm buttonhead screws (something similarly sized in SAE would work fine too like 1/8th x 5/8).
Wingnut is removable if the spool has a smaller hole that can't fit over the lip, although most spools I have you can leave the nut on, and slip it over.