MasterspoolCore for empty FrontierFila spools

Masterspool core for empty FrontierFila spools. Replaces old core.

Update: V2 is easier to open and refill.

Made to fill these empty spools (they can be disassembled in to three parts):
https://www.e-ville.com/fi/3045301-3d-tulostin-filamentti/23243-3d-tulostinlanka-frontierfila-pla-1kg-musta-valko-175mm.html

with this this product:
https://www.e-ville.com/fi/3045301-3d-tulostin-filamentti/29397-frontierfila-pla-masterspool-tayttovyhti-08kg-175mm.html

Dimensions for Masterspool concept are borrowed from this blog:
https://richrap.blogspot.com/2018/01/masterspool-proposed-standard-for-3d.html