Another failing PETG thread 🙁
Hi, I’m really struggling. With PLA I have 100% print rate but switching to PETG I can not get the stuff to stick to the smooth PEI sheet. I’ve cleaned it with alcohol, I’ve tried acetone, I’ve tried soapy water, I’ve tried 3DLac coating and even plain old bed with nothing on it.. the stuff will just not print. I just don’t understand as everyone says it sticks to the proverbial blanket normally?
It starts well and looks fine but before you know it it starts curling up off the bed? The filament is RigidInk, I’ve tried bet temps between 65-85, hotend from 220-235 (they say start at 220). I have upped first layer to 0.3mm and I’m running first layer at this point at 10mm/s really slow and it will not stay down. I’m currently with fan completely off (its no better with it on).
This is my latest attempt after a full clean..
It seems nice till the solid layer is printing, puts a few lines down then starts lifting, does this everytime. Sometimes it even starts on the brim 🙁 Why?!
Re: Another failing PETG thread 🙁
have you tries adjusting Live Z?
probably needs about 20 microns more squish
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Another failing PETG thread 🙁
Hi Joan, yeah I’m adding zoffset in prusa slic3r so as not to mess with my PLA profile. I’m currently the lowest I have been, 0.015mm higher than PLA, I’ll try lower. Thanks.
Re: Another failing PETG thread 🙁
Hi James,
test using Live Z then reset live and make the same change in your material profile
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Another failing PETG thread 🙁
Thanks for pointing me in the correct direction Joan. I think I’d become obsessed the z needed to be much higher than the PLA as I read and was always focussing on how much to lift the nozzle for the PETG. In the end I did bump up the temps by 5c to 225/80 but I eventually ended up with 80micron! closer than my picture for total offset of -0.065 compared to my PLA - who knows why but it is printing now.
Gone back to using my 3DLac, 225/80, 0.3mm first layer, 10mm/s first layer speed and offset -0.065mm. Nice prints are coming off 🙂 Thanks so much.
Re: Another failing PETG thread 🙁
Good news James
3d printing is more of an art form, than a science at the moment!
good luck.
Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Another failing PETG thread 🙁
Thanks for pointing me in the correct direction Joan. I think I’d become obsessed the z needed to be much higher than the PLA as I read and was always focussing on how much to lift the nozzle for the PETG. In the end I did bump up the temps by 5c to 225/80 but I eventually ended up with 80micron! closer than my picture for total offset of -0.065 compared to my PLA - who knows why but it is printing now.
Glad to hear it's working for you. PETG often needs a little lower live-Z to stick well, since the plastic gets gooey rather than runny when melted.
I've found it helps to think about the different material properties when you heat them to extrusion temperature: