Maybe less common than the opposite problem with prints not sticking or warping, but prints sticking excessively to your print bed may happen. Possible reasons and fixes include:
Nozzle to bed distance
Bed Temperature
Signs your bed temperature needs changing:
You’re printing at the higher bed temperature range and experiencing your prints sticking too much.
Explanation:
A hotter bed temperature means increased adhesion.
How to fix:
Check you’re not printing too close to the glass transition temperature of the material.
Reduce the bed temperature in increments of 5°C until your print adheres correctly.
You may also want to consider printing the first layer faster and/or colder.
Bed adhesion
Signs you need to reduce your bed adhesion:
You’re printing a ‘sticky’ filament such as flexible materials or PETG.
Explanation:
Some materials are known for adhering extremely well to the bed, check manufacturer information for details.
How to fix:
Degrease your bed surface regularly according to the manufacturer’s Add a very thin layer of talcum or baby powder onto your bed. Ensure you remove any excess powder.
Release agent
Signs you need a release agent:
You’re not using anything on your bed and your prints are extremely difficult to remove. On occasion, it may even cause damage to your bed.
Explanation:
Adding an additional film between your bed and the print will ensure that the print will detach taking away the coating with it instead of tearing up the bed surface.
How to fix:
Use a thin, even layer of PVA glue stick or vinyl-based hairspray coating on the build plate to act as “release agent”.
Extrusion multiplier
Signs your extrusion multiplier needs changing:
Your prints are sticking too much and are hard to remove. You already tried [nozzle too close] or can’t adjust your nozzle to bed distance. Yet you’re still seeing too much material being extruded while printing the first layer (overstuffed layer, filament is getting squished upwards at the edges of the printed line).
Explanation:
The extrusion multiplier will affect the pressure on the material flow onto the bed which will alter the adhesion of the print. Less pressure on the material flow on the bed will lower the adhesion of the print
How to fix:
Slightly decrease the extrusion multiplier and perform a small test after each change until the adhesion is correct.
Freezing
Signs you need to freeze it:
The obvious sign that you are printing too fast is when the extruder can’t If you have tried to alter settings and added a release agent without success, freezing could be the way to go.
Explanation:
Freezing the print and the print bed hardens everything which makes it easier to remove. Prevention is the best tool though, so we do suggest this as a last option or if it is too late and your print is already stuck.
How to fix:
Put the affixed print and bed into a freezer for a few hours. The print should then pop off with some light tapping once cool enough.
Filament specific tips
Filament specific tips
PETG is known to be strong enough to rip chunks out of glass plates when cooling down after a print or bonding permanently to a PEI bed.
Flexible filaments have a habit of sticking way to well to certain bed surfaces. Add Kapton tape for flexible filaments. Peel the Kapton tape from the bed, then the tape from the bottom of your print to minimize the risk of damaging your print when trying to pry it off your bed.