printer knocks off the print from the bed

[angelr5]

I have a dual extruder and the first couple of layers go down on the print bed and stick to the bed fine but after a few layers the nozzle bumps against some filament and knocks the print loose from the print bed. Either extruder will knock off the print.

[Mark]

Do you have a pic or video ?

[Kimse9382]

I have the same issue, in the first layer, the nozzle from extruder2, hit the extruded plastic and peels everything off. My extruder2 is even slightly higher than extruder1.

[Admin]

are the two nozzles leveled?

[Kimse9382]

No the one extruding is a few tenths of a mm lower that the other. I didnt level the second one yet, but wanted to make sure the first extruder was running. If they were levelled it would only make it worse.
Can it be that it is extruding too much material? So the first layer is too thick.