Can you please reduce the default extrusion feed rate used in the jog controls menu from 240 mm per second to below firmware default maximums (25 mm per second)?
When using S3d to extrude 100mm and calibrate steps per mm, the extrusion rate 240 is overridden by the firmware maximum of 25 and as a result a request for 100mm of filament results in 75 or 80 mm. This causes nasty errors when trying to calibrate correctly.
Would be even better if you could read the max extrusion feed rate from the firmware and use that value in the jog controls menu. I don't know if there is a commonly implemented g-code command for that or not though.