Upgrading Prusa Mini from Stock Extruder to Bondtech IFS Extruder

        
            

If you are installing the Bondtech IFS extruder and your Prusa still uses the stock extruder mind the following:

  • Use Steps One through Fifteen of this guide 01. Feeder Upgrade Kit to extract the extruder and re-usable parts;
  • Attach the motor gear to the stepper motor correctly by following this video: 

        

                
                         
  • Swap 2 wires on the stepper motor cable by following this video: If you are using firmware 4.3.3 don’t perform this step. Use the parameter “Extruder Direction” to reverse the extruder direction instead (know more about it here).

  • Swap 2 wires on the stepper motor cable by following this video: If you are using firmware 4.3.3 don’t perform this step. Use the parameter “Extruder Direction” to reverse the extruder direction instead (know more about it here).

Use the video below starting at 05:39. 


Upgrading Prusa Mini from Bondtech Extruder to IFS Extruder

This guide may also be partially used to install the IFS Extruder for Prusa Mini.



Don’t forget to update the e-steps


If you are upgrading from stock extruder to IFS, you must update the e-steps value to 415.    

           
    When using firmware 4.3.3 or newer, update the e-steps value using the new Hardware Settings to customize the extruder. Check step 30of our old setup guide for more guidance.    
           
    When using previous versions check steps Thirty Nine to Forty One on our Step By Step Guide.




For Klipper users

rotation_distance = full_steps_per_rotation * microsteps / steps_per_mm

rotation_distance = 200 * 16 / 415
rotation_distance = 7.71

   
           
   

The above calculation assumes the following parameters:

  • stepper motor is a 1.8 degrees motor hence 200 as full steps per rotation;
    • If you are using a 0.9 degrees stepper motor, replace full_steps_per_rotation with 400;
  • microsteps are set to 16;
  • e-steps value recommended for the BMG / DDX is 415.

 

Although we recommend to use the rotation_distance instead of the gear_ratio, we inform the BMG / DDX gearing ratio is 50:17 .