First personally designed object

Today I printed a new piece, one of the largest so far. An iPhone holder for navigation in the car.

Because it was tall and long it started to warp fast. Which resulted in a crack halway. Aldo this presented not much of a problem since the basic feature (holding the phone) stayed preserved.

A problem that’s worse is the following you can see below. The edge of an object consists out of two layers. One inner layer making contact with the filling. And one outer layer making contact with??, sometimes nothing so its not connected and loose. I know warping had its part in the problem. But I’ve encountered this problem earlier also with objects with minimal warp.

So I was thinking of printing without extra shells