Reinforced Spool for Esun 1kg spools

Spool case designed to fit with very tight tollerances, the Esun 1kg spools. The esun spools are overwound from the supplier so require a fit with less than a 1mm gap to prevent the filament from despooling off and tangling. Also, I redesigned the lovely Spannerhands design because my spools are kept inside an autoclave with the printer which has an ambient temperture of 80 degrees celsius (for warp free ABS and Nylon printing). This design works for ABS material and a very large printing noz