I totally agree, either the magnet solution does not work, or a censor should be implementer. This has damaged our 3D-printer allot, after happening twice. I managed to remove the material both times, but with the print cores being totaly ruined. Luckily i only lost 3/4 print cores, so one of them i still working. Problem is that we use the printer for work, so missing 3 print cores meant that we only do a single extrusion and not use PVA anymore untill we buy a new one.