This is a cover / cap for the X-Axis modification from Boogie: https://www.printables.com/de/model/56241-x-axis-revision-with-belt-tensioner
Easy to print, nothing special at all.
Print instructions:
→ Lay it flat on the side with the text.
Material: PLA / PETG (but not required)
Infill: 20% - 30%
Perimeters: 2-3
Layer height: 0.2mm
Support: Only on build plate (for the screw holes)
What you will need:
2x M3 x 14 screws (ISO 4762)
and obviously the M3 nuts for the x-axis revised motor mount from Boogie.
The author remixed this model.