Or printed in warping

Hello,

When I print stuff on my vertex, any flat surface on the print bed warps.
I normally get around this by printing things on their side, but this doesn’t always work. This happens with PLA and ABS Any ideas? I mean this thing is supposed to work without a heated bed, even though BuildTak have told me themselves you need a heated bed still.

Have you checked the Z axis calibration?
Is your Buildtak worn out?
What is the temp of your room?
If it’s to cold this will happen.