Sequential Shifter remixed

I've remixed the previous model in order to enhance it. Now M3 heat inserts are used, M5 screws are used for connecting the levier to the mechanism, a new design of base was created. The knob now is fixed to the levier using a M5 screw.
I've used an attiny85 that can be fixed directly under spring mechanism (the code is provided in the zip)

Parts required:
1x M4 x 50mm
3x M5 x 35mm
2x M5 x 20mm
1x M5 x 40mm
8x heat inserts M3
16x M3 x 10mm
2x microswitch
1x Attiny85
1x extruder spring

Wiring:
one wire from ground to the both microswitch
pin 0 to the first microswitch
pin 1 to the other microswitch

13/1/2024 - pulley, spring base mount and spring holder updated - a full length spring can be used.