This is my take on the protective shield. It is based on the dimensions of the PRUSA RC3 shield, but uses less material (27 grams) and prints faster - under an hour with fastest settings offered by Prusa in their design.

The main benefit is no need to make holes in the plastic shield, you can simply slide in any A4 sized foil (0,2 mm and thicker recommended) into the slot in the front and secure it with snap bars on the sides.

There's three STL files - single piece and also two and four pieces stacked on top of each other.

Print instructions

Recommended:
0,3 layer height
3 perimeters
10% infill
PETG