Sim Racing Harness Guide & Belt Roller for Micro RS7 Seat

A friend of mine in the sim-racing community was facing an issue with his seatbelt tensioner system. Because of his height (182 cm), the belt pass-through slots on his seat are positioned too low. As a result, when the system tightens, the belts compress his spine instead of pulling his body into the backrest.
We spent a lot of time figuring out how to mount rollers without damaging the seat, while ensuring the seat itself remains the primary support. We couldn't use a decorative frame that snaps into the slot, because the opening is barely 1–2 mm wider than the 3-inch belt.
There has been a lot of change to the basic idea; this version now follows the curvature and recline angle of the seat. For reference, the modified version has been tilted by 18° to match the angle of the seat back.
I am also uploading the model of the basic concept, as it is much easier to adapt to other types of seats. You can identify the original design among the models by the 'Basic' label.

What you will need:

- 4x bearings ( type 608 )
- 8x steel screws 3.5x10mm for wood/plastic see photo in the gallery
- 2x M8 threaded rods (~130mm long)
- 4x M8 self-locking nuts
- 6x M5 nuts
- 6x M5 bolts (40mm long, flat head)

Printing recommendations: To ensure the print is strong yet cost-effective, I recommend using PETG with at least 5 wall loops (wall thickness).

Important Note: To ensure it doesn't bother the user's back and to maximize strength, I fabricated the "bracing bracket" from metal, using a 3x30mm flat iron bar cut to a length of 102mm. I have included the 3D model for the plastic version as well, but please be aware that it will be the first part to break if someone accidentally grabs onto the structure.