Reply To: Milled/printed Prusa Style Printer

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Troy Proffitt

I found a really neat formula for setting the extrusion:
(mm expected / mm actual)*firmware setting

So if in Ponterface, you set it to extrude 50mm and it pushed out 55mm and your Marlin steps setting was the default 200, your formula would be:

(50/55)*200 = 181.81

After you get that number, go into the configuration.h and navigate to the row DEFAULT_AXIS_STEPS_PER_UNIT and change the last value from 200 to 181

In Ponterface, you can use M503 to see the existing value for DEFAULT_AXIS_STEPS_PER_UNIT
You can also use M92 E<insert value> to change the extrusion steps on the fly without flashing the arduino board

Here is a great article about it: Rep Rap Calibration