I've been experiencing lots of reliability problems with Z-PLA Pro on an M200. In search for a solution, I've found these Tips for Printing with Z-PLA Pro.
One of the recommendations is this:
"Unload Z-PLA Pro from the hotend immediately after the printing process. Do not keep the overheated material loaded in the extruder so as to avoid material degradation in the nozzle."
I can understand why Zortrax recommends this, but frankly it is quite unpractical. I am using the M200 in a professional context, meaning that the machine is often running over night while nobody is in the office. So if a print finishes some time at night or early in the morning, nobody is there to unload the material while the hot-end is still hot.
What I would really need is some kind of "auto-unload" option. Maybe there could be a checkbox in the Z-Suite where I could specify that the filament should automatically be unloaded once the print-job is finished. This would be extremely helpful!
(Another idea in this context is that maybe the fan should run at full speed for a while after finishing a print in order to minimize the degradation of any material that is still left in the hot-end.)