Sequential Shifter Simracing (no Electronics)

This is my "heavy duty" sequential shifter for simracing. It's based on a ball bearing that is pushed against two microswitches. I have not included electronics in the design but you can use an Arduino Micro pro (with USB support) or even use an old gamepad and solder the two microswitches directly to the board.

There are two diferent levers for a shorter or longer grip.

Materials:
- 1x 6000 ZZ ball bearing
- 2x 626 zz ball bearing (optional)
- 2x 55mm springs
- 2x 20mm microswitch on-off 3-pin

Screws, nuts and washers:
- m4 2x 20mm
- m5 2x 35mm, 5x 45mm
- m6 2x 35mm, 2x45, 1x55mm

Print:
- 20% infill
- 0.2 and 4 wall lines.
- Although it's not crucial, you should have the XY expansion properly adjusted so holes have the right size.

Assembly:
It should be quite straight forward:
1. You start with left_base, screw both switch holders using m4 screws and nuts. Solder the cables before installing the switches. They are just pushed into the holder.
2. Scr