Calibration

Steps:

1. Preheat nozzle (bed pre-heating not required)

2. Remove Boden tube from feeder

3. Remove filament until it is no longer in Boden tube, but still in feeder

   1. Retract filament until even with exit from feeder

   2. Set printer to extract 100mm of filament

   3. Measure filament extracted

   4. Adjust steps

   5. Repeat at 3.1 (Retract) until 100mm of filament is extracted