Protection Visor 3-part snap assembly

I updated the split design, inserting a snap-together assembly piece to avoid the glueing.

EDIT:
Added STL files for batch production on 140x140 mm build plates (e.g. Flashforge Finder).

EDIT 1st April:
Updated files with bugfix on rods causing slicing to fail on some slicers.
Added plate batch files for 220x220 mm build plate

EDIT 6th April:
All STL files are updated.

There are now two versions of the side rods:
- VisorSplitSnapLeft/VisorSplitSnapRight
This is the original version from the quoted source.
- VisorSplitSnapLeft/VisorSplitSnapRight
New version with a hook inside the slit to lock the transparent sheet. For this version, the transparent sheet (size A4) should be perforated with holes in "888" pattern (8cm between each hole). Only the holes at the ends will be used.

Build plates are provided for both versions, for a 140x140 mm build plate (Flashforge Finder).

An other nice design for small build plates: https://www.thingiverse.com/thing:4264978