PRUSA MK2S DUST FILTER/OPTO FILAMENT RUNOUT SENSOR

Designed for use with a simple opto endstop as pictured above. Top has 4mm seat for a reverse Bowden tube to your spool.

Once you have it wired and tested with filament that it sensors correct in the PRUSA LCD menu, hot glue sensor it into place in the clip, add a small piece of foam to wipe dust off filament and print away.

How to wire sensor to the rambo board can be found here https://github.com/3d-gussner/Prusa-Firmware/releases

Firmware hex is attached which I fixed a little from 3d-gussners and complied for the opto sensor to function. https://github.com/TheZeroBeast/Prusa-Firmware

Note that the latest changes on the TheZeroBeast GitHub above have menus for enabling and configuring any filament runout sensor from the LCD menu.

Note from Guessner regarding the firmware tweaks. "The firmware has Advance Linear Integration activated and you should follow the instruction. You also may have to adjust your slicer to get best rusults. Also do the PID tuning and PID bed tuning. The firmware contains my PID settings as default. I use the E3d sock and some cork under the heated bed which changed the Prusa PID settings quite a bit."

Linear advance setup: http://marlinfw.org/docs/features/lin_advance.html

Differences to original Prusa i3 MK2 firmware 3.0.12

Linear advance

serial baud rate set from 115200 to 250000

German translation by 3d-gussner

Dutch translation by 3d-gussner

Few English changes

PID calibration menu with 8 cycles

PID bed calibration menue mod by 3d-gussner

PID values for bed saving

Preheat order changed from ABS/PLA/... to PLA/ABS/...

Filament runout sensor changed to pin 24 'y-max' endstop

Added filament runout status to 'Show end stops' menu

Under 'Calibration' -> 'Show end stops' you will find new FR_S value, which has to to be

1 when filament is loaded.

flickering between 0 and 1 when filament run out

0 is runout switch is not connected right OR if you use all three pins filament ran out.

Added more firmware information to 'Support' menu

How I Designed This

Designed in fusion360 from measurements taken from the remixed thing.

Simplistic and practical adoption of the previous design with an optical endstop sensor to detect when filament runs out.

Category: 3D Printer Accessories