I recently inherited responsibility for a TAZ printer at my workplace. It has been in operation for a couple of years, however the person who used to operate it no longer works here, so I am having to learn on my own.
It’s been going pretty well so far, except that occasionally when I press Print in Cura, when it tries to move upwards on the z-axis in order to re-adjust the position on the bed, rather than moving it just makes a grinding noise, then proceeds to move across and downwards, causing the hot end to gouge into the bed. Luckily I have always intercepted it before it does any real damage.
This is frustrating because it means I have to cancel and re-start the print, sometimes several times, before it works properly. I know it’s not something simple like a jammed z-axis screw, because it works properly sometimes, and when I move the z-axis up and down using printrun it responds perfectly. This problem also sometimes causes the x-axis bars (sorry I don’t know the proper terminology!) to become skewed, and need re-leveling, which makes me think it is a problem with just one of the z-axis screws.
Thanks so much for any insight!