I'm having trouble with my 3D prints detaching from the printing surface before they're complete. What causes this and what are some ways I can prevent it from happening?
Detaching of 3D prints from the build plate can be caused by several factors, including:

Poor bed adhesion: This can be due to a lack of adhesion between the build surface and the first layer of the print. This can be improved by using a build surface that has a good adhesion, such as a heated glass bed with a layer of glue or hairspray.

Bed leveling: An uneven build surface can cause the first layer to be distorted, leading to poor adhesion. Ensure the bed is level and properly calibrated.

Warping: This occurs when the edges of the print cool down faster than the center, causing the corners to lift off the build plate. Warping can be prevented by using a heated bed and a material with good dimensional stability, such as ABS or PETG.

Printing temperature: If the temperature of the extruder or bed is too low, the material can become brittle and not adhere well to the build surface. Ensure that the temperature is set correctly for the material being used.

Retraction settings: If the retraction settings are too high, it can cause the material to detach from the nozzle and leave gaps in the print. Adjusting the retraction settings can prevent this from happening.

Some other general tips to help prevent detachment include:

Cleaning the build surface before each print.
Using a brim or raft to provide additional adhesion.
Using a cooling fan to cool the print evenly.
How to level my printers bed?