DIY MAIRA Belttensioner - siManthrop Edition

I designed my own Version of MAIRA's affordable DIY belt tensioner. Much smaller and more rigid with an excluded PSU.

Documentation: https://mairapp.com/home/maira-seat-belt-tensioner-kit/

Please read both manuals before starting this project!

The Seatbelttensioner can be used with MAIRA App or to get it compatible with every Sim with MAIRA-Simhub Plugin! I am actually making my own SeatBeltTensioner Plugin with many Features Maira or Simhub doesnt have, will publish it soon.

Recently i added two progressiv Levers, they have the benefit of higher Speeds around Idle and higher Pulling Forces. Also they reduce Stress on the Gearbox.

Instead of the PSU I suggested, you can also use any other PSU with 12V and 30A. Like the original one MAIRA recommends.

What you'll need:

• Arduino Nano(I can recommend Elegoo, be careful not to buy Fake Arduinos!) 
  https://www.amazon.com/dp/B07G99NNXL

• Nano Terminal Adapter Expansion Board 
  https://www.amazon.com/dp/B073JGV87F

• 150KG Digital 180 Degree Servo with Servo Arm
  https://www.amazon.com/dp/B0CCP19V4J

• PSU: MeanWell GST280A12-C6P   (Please be sure to select the 12V option!)
  https://aliexpress.com/item/1005009776004881.html

• Molex Mini-Fit 4.2mm socket

• 2m USB cable(depending on your Arduino Nano USB-C or Micro-USB)

Screws required:

• 2x M3x8 ISO 4762

• 4x M3x15 ISO 4762

• 12x M4x12 ISO 4762

• 4x M6x15 ISO 4762

• 4x M6x20 ISO 4762

• 2x M6x15 ISO 10642

• 4x M6 Washer

• 2x M6 Nut

• 8x M6 T-Nut

Needed Heatinserts:

• 2x M3

• 12x M4

The Printparts can be printed with almost no supports. Only at the Pulley Supports are needed. Please be careful in which direction the Housing will be printed, picture attached.

I printed the Mainbodys and Pulleys with an 0.6mm Nozzle, 4Perimeters and 30% Gyroid Infill. I recommend PETG, but PLA will be fine too.