There are times when the printed part of the model shrinks from the bottom and starts leaving the platform. If the image below is representative of your print. Your machine is experiencing warping.
So why does Warping do occur?
The plastic that comes out of the nozzle of the FDM printer is at high temperature. Due to the material property of plastic when it cools it starts to shrink thus leaving the platform.
Some important tips to minimize warping includes:
2. Bed Leveling
Make sure the corners are leveled properly because an unleavened bed can also cause warping.
3. Apply Adhesive
By applying some adhesive like glue will the model stick with bed properly thus preventing warping.
4. Use Brim
The brim will create a small layer around the model and thus preventing the shrinking from the corners.
Raft creates a single thick grid between the printing platform and the model. This is particularly very useful for objects which do not have a flat surface.
The cooling should be provided gradually. For the initial layers, the cooling should be turned off and this should be turned on gradually as the model gets printed.