Hmm, the head was calibrated exactly as you describe, I took the hot end off and just fed filament and measured it.

yes it's a direct drive via a small brass gear and pressure roller.

i will try measuring the temperature tomorrow, I presumed it was not far off as at room temperature, the display was spot on, I'm using a Rex C100 pid controller.

i have tried forcing feed by hand but could not get anything more than a smudge out. I will try withdrawing the filament and checking the hole.

am I right in guessing I should get a continuous thread of PLA out?