Anet A8 Upgraded Easy Magnetic Extruder Access Mod

Added some improvements:
- Added a new fan grill
- Streamlined the inlet for a better airflow
- Reversed the screws, that way the nuts are on the inside. Looks better and it makes it easier to assemble
- Added a lid to make it snap in place better

This design is based on 5x2 round magnets. These are widely sold, for example AliExpress. If you got other magnets lying around, feel free to make adjustments to the SketchUp files.

Needed materials:
- 4x 5x2 round magnets
- 2x M3 screws (s