Note:

This is no actual thing but I wanted to share it here anyway.

After a view years of use and experiencing several problems with the original printed extruder (filament stuck, missing steps and the bowden tube came off several times,...) i decided to replace the extruder with a new one.

• I choosed the CR-10 extruder in the aluminium version (about 15€).

• The extruder is mounted at the top of the Z-axis aluminum extrusion using 2 M4 standoff-screws (see picture for details)

• The extruder has no big gear so the Extruder steps per mm have to be adusted accordingly.

How to calculate the extruder steps per mm

• The default setting for the CR-10 extruder on creality printers seems to be 95. This is the default setting to start off:
  

  M92 E95 ; Set extruder steps per mm

• Choose a fixed reference point on the extruder for your measurements (I used the exit connector for the bowden tube). Do not connect the bowen tube yet - otherwise you can't see your marks!

• Insert filament and set the first mark on the filament at your reference point

• Use the setting above, heat the nozzle and extrude 100mm at a medium feed rate and mark again at your reference point.

• Repeat the above steps until you have at least 4 sections marked.

• Remove the filament and use a ruler or calliper to measure the distance between the marks. They should be close to 100mm - but are probably a view mm off.

• Write down your measurements and calculate the average distance

• Calculate the steps per mm using this formula:
  default steps per mm x 100 / measured length = E-steps per mm
  Example: 95 x 100/101,2 = 93,873

• This results in the following g-code:

  ;Set extruder steps per mm (CR-10 Extruder, Default: 95)M92 E93.873

Hint:
To get even more precision repeat the steps from above - but now replace the default value (95) in the config.g file and the formula by the calculated value from the first pass.