Simplify3D User Forum

First layers are always squeezed and printed with bigger outer and smaller inner perimeters.
In my case:
1st layer has +0.25mm outer dimension, -0.25mm inner dimension
2nd layer has +0.20mm outer dimension, -0.20mm inner dimension
3rd layer has +0.15mm outer dimension, -0.15mm inner dimension
4th layer has +0.10mm outer dimension, -0.10mm inner dimension
5th layer has +0.05mm outer dimension, -0.05mm inner dimension
It would be nice to compensate such deformation.
Until such feature is implemented I use chamfer feature for bottom of my parts but it wastes much time to make such preparations for my models.

If your perimeters are coming out like that, it means you are too close to the bed in the beginning. So your first layer is being extruded in far too small of a space and ends up being really wide. Then there is still some leftover affect on the 2nd and 3rd layers until it finally starts to even out.

If you get the first layer positioning correct, even the perimeter width on your very first layer will be correct. I had the same thing happen to me until I adjusted the positioning to get it right.

My printer has an autoleveling Z-axis routine when print starts. Do you mean that this routine is not correct and I must change the bed position manually in start g-code script?

You'll find the bed levelling routine on any one printer, be it automatic or manual (like my printer - I use a 3M Post-It note as my gauge!!), will leave the zero location for the z axis at a very slightly different place. This isn't an error...but a fact of life. And then it's down to the slicer software to do the fine tuning to get things perfect. The most important thing is that a consistent levelling method is used each time to give a starting point for the software.

In Simplify3D, the global z offset can be conveniently used to fine tune each process so that you can get consistent placement whenever printing with any particular material at any particular layer thickness.

When the foundation of a part is critical, I find printing on a raft resolves first layer issues.