Spool Holder - One to rule them all

Spool Holder for the #FilamentChallenge

Requirements:
- work with majority of the spool in the market
- fully printable
- minimal parts and assembly

Problem and motivation:
- Internal, external diameter and height change from spool to spool.

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Results:
- Three piece design. Easy to assembly and adjustable.
- Tear drop design allows for self locking.
- Minimal mass reduces printing times.
- Wide base guarantees stability.
- All p