Edit 2018/07/05: Replaced with new version. Wider slots for the zip ties, filamend end holder improved
My Masterspool approch, inspired by https://www.thingiverse.com/thing:2769823 and https://www.thingiverse.com/thing:2791112. The goal was to use less material than the original Masterspool design, to save filament and print time, and to have a filament catch that doesn't have the filament end poke into any plastic bag used for storage.
3 perimeters recommended for the threads