Commissioning
Calibrating the Extruder
In the motherboard firmware, configuration.h file (if there is .dist extension on it copy and paste into the same folder named configuration.h) you have a value that you will need to change in order to have your RepRap/RepStrap working correctly.
E_STEPS_PER_MM
This is set to 0.706 which is the 5mm splined shaft with no gearbox, if this is what your using, change nothing. However if this is not the case you will need to make some measurements and jot them down.
Filament Diameter
Nozzle Diameter
Pinch Wheel Diameter
Steps of stepper
Adrian B. used the formula
<math>\frac{1}{\frac{\pi\varnothing_{pw}}{Steps_{360}}.Ratio_{Nozzle to Filament}}</math>
Where as in the recent blog post the formula is
<math>\frac{\varnothing _{Nozzle}^2 . Steps_{360}.Ratio_{gearbox}}{\varnothing _{Filament}^2. \pi . \varnothing_{pw}}</math>
Both of which are confusing, so Grogyan came up with
<math>(\frac{Steps_{360} . Ratio_{gearbox}} { \pi . \varnothing_{pw}}) . (\frac{\varnothing _{Filament}}{ \varnothing_{Nozzle}})^2</math>
Essentially what is happening is having the ratio of filament and nozzle squared, multiplaied by the arc of one step of the stepper motor.
Note to self add a method of putting values on this page and output the correct value.
Personal thanks to for enabling formulas to be put into wiki's
sitmo for their equation editor
Formula Help for the correct syntax
