Printing objects don't stick to print surface. Mostly happens on multiple objects.  

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

This is it failing on a single print. Shortly before this I had a successful print. I seem to have better luck when the plate cools down before printing again, but I'm not sure if that is actually causation or if it's just me looking for a correlation.

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

This is for the pei bed, and pla.

Bed needs to be very clean, see tips in forum on how to, this is very important, fingers on the bed is bad.

Clean with dish soap, as often as needed.

Clean before every print with alcohol.

If still not sticking use aceton, this destroys your pei on the steel plate, but some times its needed.

1 layer needs to be perfect, to high, then sicking is less.

Then you could use a glue stick.

Use the setting brim attache to the model, 4 lines.

Big flat modes i always use glue stick, with every filament.

New steel sheets stick a little lesser, use a while then it sticks better.

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

Wash the sheet with soap and water, dry with fresh paper towels.  Then bake it at 80c for 30 minutes on the heat bed to dry out the nooks and crannies in the sputtered surface. 

Most powder coated sheet owners have found an initial good hot water wash is needed to get the manufacturing residue off the powder coated sheet.  After that, an alcohol wash with gloved hands is usually enough.

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

Looks to me like you need to turn the nozzle temp up

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

@tim-m30 and @peter-m26 are steering you right. If parts are popping off and blobbing around the nozzle, you've got bed adhesion issues. Clean the PEI print surface and re-calibrate your Live-Z setting. There are dozens if not hundreds of posts on doing this, so I'll refrain from the usual copy & paste. No worries, this is one of the 1st lessons anybody new to 3D printing on the Prusa FFF printers encounters. Get adhesion and Live-Z figured out and you'll be in great shape. If you want to read up more on the details, I've got some notes available.

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

I've been having better luck and getting it working more reliably now, however am still having issues some of the time where it doesn't adhere properly to the surface and it pulls up. It tends to happen in roughly a third of the larger prints now, still more often then I'd like but getting better.

I haven't yet tried to bake the sheet which is likely my next step, I'll also look through the troubleshooting notes.

Thanks for the help, it is getting easier but there is a lot more to 3d printing then I realized before getting into it.

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

for larger prints in PLA I use 70c for the bed!

Joan

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

It is a constant balance. If you get the z axis right and the nozzle is clean and you have the powdered coated steel sheet. I find that 9 times out of 10 the nozzle temp needs to be adjusted because of the change In temp in the room. Then it just sticks. I really only mess with nozzle temp now to get it to stick

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

Do not just slap glue on the plate like some idiots. It's a number of things. Fine balance

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

You have some good suggestions from above. 

• Clean the PEI plate with soap and water (but don't touch it with your hands when you are drying and putting it back on the printer - use gloves or hold just the sides.
• If windex doesn't work, you can use 90% isopropyl alcohol (not denatured or other types)
• Constant temperature is key (room, build plate, etc) Don't let a fan blow on the printer, it will cool the material too fast. 
• A Live Z setting of 1.8-1.9 seems very high. Check your hot end build instructions to make sure your hot end is right. 
•  

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

I've managed to mostly resolve my problem, the sticking was resolved by cleaning the bed well, there is some issues with Live Z settings but they're set to closer to 1.1 now and it's working a lot better, I find that I need to readjust the Live-Z settings whenever I load new filament so after I unloaded and loaded a few times in troubleshooting it worked much better. I have alcohol wipes I keep by the printer now and am using those to clean the bed after print jobs.

I had issues with the filament bubbling and not lying flat but found that was the live-z was set to low that was causing that.

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

IPA wipes do not have enough alcohol to do a good job , you really need enough to dissolve any oil and an absorbent enough towel to lift it up . i keep a bottle of 99% IPA at the printer and pour a small puddle on the bed and use a new tissue to wipe it around and up 

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

IPA wipes do not have enough alcohol to do a good job , you really need enough to dissolve any oil and an absorbent enough towel to lift it up . i keep a bottle of 99% IPA at the printer and pour a small puddle on the bed and use a new tissue to wipe it around and up 

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

IPA wipes do not have enough alcohol to do a good job , you really need enough to dissolve any oil and an absorbent enough towel to lift it up . i keep a bottle of 99% IPA at the printer and pour a small puddle on the bed and use a new tissue to wipe it around and up 

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

Say it again, brother!

RE: Printing objects don't stick to print surface. Mostly happens on multiple objects.

70% ipa works fine. Turn up your nozzle temp.