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Part Lifting off of build sheet  

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Sean
 Sean
(@sean-6)
Trusted Member
Part Lifting off of build sheet

I have been trying to print a part that is basically a plain old rectangle that is lifting off of the build sheet in the 4 corners a few hours into the print. the curling is enough that it causes a bulge in the exterior wall of the print for a single layer.

I tried adding a 4 mm brim to the print but it still lifted.

My bed temp is 60c
Hot end temp is 210c
Ambient is 20c
I'm printing with regular Hatchbox PLA

This is the first print that I have had this lifting issue with. Can I use this glue stick that was included with pla? I assumed it was for abs.
My other printer has a glass bed and I use hair spray on that but did not want to use that on the pei sheet.

Does anyone have any suggestions for getting the part to stay flat on the build plate through out the entire print?

Opublikowany : 10/05/2018 1:33 pm
ron
 ron
(@ron)
Estimable Member
Re: Part Lifting off of build sheet

The noozle maybe too high for the first layer. Adjust live-z. Clean the bed with IPA.
If your part is large, you can be stuck with original design and firmware if your bed has a severe not nice level.
Read more on "hyperfine mesh bed leveling" but that is only for mk2 at the moment. And
[Testers Needed!] TPU "micro springs"

Opublikowany : 10/05/2018 2:19 pm
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Part Lifting off of build sheet

Yeah, I have found that hyperfine bed levelling is not needed on my Mk3 - although it will work if you really want it to...

You could also try increasing the bed temp to 65 degrees.

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Opublikowany : 10/05/2018 3:35 pm
Sean
 Sean
(@sean-6)
Trusted Member
Topic starter answered:
Re: Part Lifting off of build sheet

The nozzle height is set correctly. The print adheres fine but what is happening is over a few hours when the side walls are being printed as they cool they are shrinking and it is causing the part to lift in the four corners.

I decided to try a different print footprint and rotated the part on its x axis 90 degrees to see if I could lessen the pulling force being exerted on the build plate. I think this issue is unique to the geometry off this part because I have printed some long flat parts that were almost the size of the entire bed and have not had this issue previously.

Print and Learn... I guess.

Thanks for the suggestions. Do either of you know if you can use that glue stick that came with the printer on PLA? Also, is it hard to clean that glue of the PEI sheet?

Regards,
Sean

Opublikowany : 10/05/2018 4:45 pm
PJR
 PJR
(@pjr)
Antient Member Moderator
Re: Part Lifting off of build sheet

Yes, you can use the glue stick, and yes it's easily cleaned with a damp paper tissue (or three...)

Peter

Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…

Opublikowany : 10/05/2018 4:55 pm
Blackbird351
(@blackbird351)
Eminent Member
Re: Part Lifting off of build sheet

I see the same issue now and then, depending on the part. I usually lower the nozzle temp as low as I can, and raise the bed temp to 65-68, from 60. I print hatchbox at 195-200 after first layer.

Opublikowany : 10/05/2018 6:53 pm
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