Medium Masterspool

Here is the "Medium Masterspool", a spool much stronger than the "light" versions and much lighter than the original version.
I wanted to print a light spool and I broke it.

Here are the advantages of the spool:
- More solid than a "light" version:
- Slightly thicker
- the central rods are printed flat and therefore much more resistant
- Lighter and faster to print than the classic version
- Able to roll on a support

This spool has been tested for the moment only with an 850g Fiberlogy refill.

There is the possibility of screwing the different parts with screws of 3mm x (12mm minimum) and a nut.
On my version I used a screw to test and it works, but the spool works without screws.