I think I broke something. Because of a wrong gcode file I created with another program and tests with bCNC in Linux, the head crashed into the top and into the stock when moving along the z-axis. Now it seems to be a bit loose, see attached photos. First photo you can see the top of the shaft, second photo when I push it from below. I think this was rigid last time I used the jog to set the z-offset.
Very sorry to hear about this difficulty.
Please send those photos in to us at firstname.lastname@example.org if you haven’t already and we’ll do our best to work through this with you.