Curse you warping! any ideas on how to fight it. I am printing in PLA. no heated bed and on painters tape
I print on blue painters tape with a bed temp of 60 degrees with no warping
Did the base layer not adhere to the bed?
Print a brim. Should solve the problem. If you have a heated bed too
well I have a printrbot simple metal with no heated bed how do i upgrade it
It looks like you deformed the part while removing a hot part from the bed. Warping usually produces a flatter top surface.
It’s just how it is until you get into heated beds and chambers, you could always cut up the part and print smaller pieces then glue them together.
You could also try different materials and try using some sort of glue on the build plate to hold it down better.
For many years I used blue painters tape. Oily skin can ruin the bond… take a clean dry flat object and drag/scour it across the surface to ruffen it up. Use a brim, too!
Hairspray . Seriously try it! I won’t use anything else and I put off using it for nearly 3 months because I thought it was dumb.
I just spray it on the bed with the tape?
No tape. Just spray the bed directly
Poor-man’s heated bed
Get a microwave heat pack, put it inside a freezer bag and tie a knot to keep in the moisture.
Put some UHU glue (or similar) on the bed first.
Put the heat pack in the microwave for about 2.5 minutes , then place the very hot heat pack on the printer bed.
After about 5 minutes, take off the heat pack and start the print immediately.
The bed surface should stay warm enough for long enough for the print to stick pretty well.
This quick hack works fine for me each time I need a heated bed for my non-heated bed Printrbot.
@Paul_Gross or a propane torch 
as was said. this was a result of removal. warping would still have a flat top
@Dmitry_Romanovich I have had this problem also. The solution was patience till it cooled.
When possible, design your objects with minimal contact with the bed on the first layer.
When you can’t design with minimal first layer contact, lift off the tape to remove it. Of course you will need new tape after that…
Hit it with a quick shot of hair spray. The heavy hold stuff.
Or you could print on a raft.
Detaching from on top of a raft without warping should be relatively easy, especially since you won’t mind damaging the raft.
I use watered down pva glue, cleaner than hair spray and less waste plus cleaner prints than tape. Heater bed really is the trick, but failing that try the brim as people are suggesting, and whatever adhesion you think works for you.
If this was bent on removal… are you using a fan on the print surface. None of my prints have ever been soft at completion, even if i peel them straight away