So I was trying to print 3DBenchy on my new Wanhao i3+. PLA plastic, basic high quality settings in Cura (I guess 0.06 mm layer, 40 mm/s speed, 50c bed temp, 195c extruder temp). I didn't use any tape, just regular wanhao printer mat, which was installed on printer bed from the box.
At some moment when I looked I found things fouled up: object came off from the mat and sticked to the extruder and was moving with it. It printed like 3-4 mm of the object (about 50 layers) before this happened.
I would like to know what are the main reasons this can happen? And what can I do to prevent this? I think it's very sad when you lose many hour of work.