Filament cleaner with jam sensor

Compact filament cleaner for mounting on a side of your printer, with holder of PTFE pipe and sensor for detection of jammed / ended filament.
For cleaning of filament I recommend to use part of sponge curlpapers (found in wife/girl/mother's cosmetics or to buy in any drugstore, if you don't want to risk ;) ), it has right diameter and useful axial hole ideal for filament.
For making a sensor you need some other things except printed body:

• 2x bearing 623 (3x10x4mm)
• 2x steel axle fi3mm (I used plain part of old drill 3.0mm)
• bottom roll, it can be plastic/metal/anything but I recommend to do it of teflon. Diameter: 6mm, but important is to do a groove around, without it sliding resistance is too high.
• upper roll, it is just a pinch roll from old tape recorder, drilled for 3mm axle. Diameter of roll used by me: 9mm
• hall sensor: I recommend TLE4905, but it can be any other unipolar.
• 4x neodymium magnet fi3x2mm
• plastic disk for these magnets. In my case it is made from plexi, but it can be printed. You can also try to use more than four magnets for higher resolution.

I'm using this sensor with Repetier, my configuration for it (with four magnets and extruder steps per mm = 196.30) is as below, of course without semicolons. Sensor should be connected as Xmax end-switch, without any other elements, just connect Vcc to Vcc, GND to GND, Out to Signal input.

;#define EXT0_JAM_PIN ORIG_X_MAX_PIN
;#define EXT0_JAM_PULLUP 1

;#define JAM_STEPS 2944
;#define JAM_SLOWDOWN_STEPS 4400
;#define JAM_SLOWDOWN_TO 70
;#define JAM_ERROR_STEPS 6000
;#define JAM_MIN_STEPS 30
;#define JAM_ACTION 1