Easy to print FlashForge Creator Pro 50mm filament holder

**This model is obsolete. I highly recommend to print [the new adjustable spool holder instead.](https://github.com/DrLex0/print3d-ffcp-adjustable-spool-holder)**

This is an alternative version of the 50mm spool holder by RonPossible, for the recent revisions of the FlashForge Creator Pro. This is suitable for filament spools with a simple cylindrical hole of 50mm diameter and 60mm length.

The differences are:
* Ready-to-print support material is provided, with small tabs to ensure the ov