Filament wont stick to print bed (PLA)  

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jaroslavvondrak12
(@jaroslavvondrak12)
New Member

Hello everyone,

I have a problem that filament wont stick to print bed. First 24 hours went everything great. Then the layer shifted. So I canceled printing and start it again.  

From that time, filament wont stick to print bed even with glue. I tried recalibration, increase/decrease temperature. Nothing working. Any idea what could be wrong? 

 

Posted : 18/05/2019 12:20 pm
Vojtěch
(@vojtech-3)
Honorable Member

During your layer shift the PINDA probe may have hit the model and shifted. You need to redo your 1st layer calibration. The "Live Z" number needs to go a lot more negarive, at least 0.2-0.3mm more by the look of it. The extruded plastic isn't squished enough against the bed.

Also, the bed looks rather seriously contaminated on the pictures. It's possible it's just the glue, but in any case, you need to clean it to get PLA to stick. As the simplest and very effectivr approach, I would recommend a thorough wash using a kitchen soap (or a kitchen degreaser if you have one), and then a thorough rinse in hot water. After that, don't touch the surface with your fingers, let it drip near dry and remove any remaining moisture with a fresh kitchen paper towel (or a dust-free, "cleanroom" wipe if you have one). A subsequent quick scrub with acetone on a clean kitchen paper towel (if you have clean acetone) will improve the adhesion even more.

When printing PLA on PEI, no glue is needed, but the PEI sheet needs to be meticulously clean and free of oily substances, including skin oils, greases, and most importantly silicones.

Posted : 18/05/2019 5:41 pm
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sheriff
(@sheriff)
Active Member

im getting a similar problem. ive tried cleaning the bed with every method mentioned on the net. the inital start is ok, its half way through it decides to lift away and fling it around. very frustrating. tempted to send the poxy thing packing

 

Posted : 24/02/2021 11:49 am
Vojtěch
(@vojtech-3)
Honorable Member

@sheriff

If the bed is clean, then it's very likely, like in the first post here, a first layer Z offset calibration issue. Can you post photos of what's happening?

Posted : 24/02/2021 11:58 am
MileHigh3Der
(@milehigh3der)
Estimable Member

It is winter and dry in most of the world, but I was amazed at how drying my PLA helped improve the first layer.  Now, the difference between a day or so isn't probably much from your first to second print.  I had poor adhesion and curling of the traces with Prusament PLA and then dried the filament in a heated dehydrator for a few hours.  Much better layout and adhesion.

I agree that height does seem to be the major driver here.

Posted : 24/02/2021 1:52 pm
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