Smallest Motion(Smart) Filament sensor mk2

For now it seems working, future changes on demand/result of long term testing.

6.4.2022
replaced by https://www.thingiverse.com/thing:5342918
5.3.2022
It wil grind through hole and starts slipping in about 100m of PLA. You may try ptfe from both sides or use nylon on body, but I currently working on 3 bearing versión.
3.3.2022
aditional distance of axis
28 tooths encoder instead of 30 (precision 0,45 -> 0.9 in Marlin)
filament hole 0.1mm closer to axis
PTFE ends before wheel, option add/remove PTFE to both sides - you can have wires to left instead to right

28.2.2022 - fine tunning - added 0,2mm between axis and sensor - I was getting false alarms, tooth encoder base partly covered sensor

28.2.2022 - first mk2 version, currently in testing

resolution < 0.5 - you can use 1mm setting in Marlin FW motion sensor section
accurate - can detect missed full step.

If you get random filament runouts during print, than you have step skip or filament slip at extruder nor