I've recently had the same thing happen, except it just broke the print off the bed. When the print head moves to the unloading position the bed is raised at the same time and the nozzle can hit the printed part from above or hit it with guide rods when moving to unload from the second core.
This raising of the bed doesn't happen every time, and so far I haven't figured out what makes it happen. Firmware 7.0.2.0 for me.
With material station it extrudes a little material while cooling down before pulling the filament to the parked position. This is done on the left for core 1 and on the right for core 2 (same as loading filament), so if both are used it moves to the other side of the bed at some point when unloading.
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gr5 2,224
What? That's crazy.
1) What version of firmware do you have on the printer (you can see it in the maintenance menu on the front of the printer).
2) Could you please post both the ufp file and the project file here?
3) Do you print using USB flash or through digital factory?
I'm wondering if you have something wrong with your printer profile. For #2 project file (which will include your model - I hope it's okay to publish) do "file" "save project as". For the #3 ufp file hopefully it's still on your flash drive so you can send it to us - a ufp that definitely has the issue.
By the way at the end of the print it should RETRACT. Not purge. It cools down both cores to a specific temperature. When it reaches that temperature it retracts. This keeps the nozzle cleaner and the shape of the filament cleaner and it makes it easier to remove a core or to remove the filament later without having to heat things up. It should not move the head around while doing any of this.
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