Bottom layer is bending  

RE: Bottom layer is bending

Most importantly, make sure your live z is properly calibrated and your steel is clean (using hot water and dish washing soap). Those two factors account for the majority of issues people are reporting here. 

But some models are intrinsically more finicky, especially large, rectangular ones. Here are some methods that have worked well for me:

• Slow down print speed.
• Add Mickey Mouse ears to the corners. There's a "helper disk" in PrusaSlicer's Add Part library but I prefer to simply add a cylindrical, maybe 10mm diameter, change height to single layer height, then place the part at the corner. Repeat for each corner.
• Add a brim around the model, 5 mm or more. Wider or 2 -layer high brims may be needed but may not work with the size of the model or may require being added in your CAD software.
• Use Layerneer Bed Weld ( https://www.amazon.com/Printer-Adhesive-Layerneer-Original-Filament/dp/B079984GV5/ ), Magigoo or similar. . You only need a thin layer.
• If you have design control over your part and it's possible considering the intended use, you can try to round the edges and/or add holes to the base of the model.Combination of above.
• Usually, brim/ears does the job, or some Layerneer if needed, but large, rectangular objects can be a challenge.
• Also, drafts can encourage warping, so printing in an enclosure (with doors open for PLA) may help.

RE: Bottom layer is bending

Thank you 

I am going to try it 

RE: Bottom layer is bending

Just to confirm, in picture 3, is that protrusion printed facing up?  Is that bulge where the print changes to that protrusion?  I have run into that as well.

RE: Bottom layer is bending

In picture 3, That's what happens when the bottom layer comes loose. Then the layers are pressed together. that's what you see in picture 3.