Lightweight Spool V2, 60g

Spool for filament with inner diameter of 84,5mm.Made the spool even lighter. It another iteration to save filament for spools.Added ribs for more stiffness. This may bend a little whe nlaying on the desk, but hanging on the ams works just fine!Currently this project weights ~60g. Compared to previous version its 90g lighter, and compared to original its 120g saving.