Too strong adhesion PEI sheet with PETG material
Hi,
Using now PETG instead of PLA, I have replaced recently the PEI sheet of my MK2, The problem is that the new PEI sheet is now localy damaged due to too much adhesion. I know now that I made a mistake because I used IPA for cleaning.
Then I am using now a window cleaner but if I extract the part with a cool bed and use a spatula, the adhesion is still much too strong. I made several tests and modified some parameters noze and bed T° without success ( nominal parameters are : ambiant T° = 20°, noze T° = 235° , bedT° =75° and first layer thickness 0,2 mm, PETG filament from Prusa,).
Before changing again the PEI sheet, I would like to understand what happens ...
Re: Too strong adhesion PEI sheet with PETG material
PETG is crazy adherent. After cleaning your bed with window cleaner:
1) On a non heated bed, apply thin even glue stick. Just the general school kid variety from the store - nothing fancy. I use this : https://www.target.com/p/elmer-s-174-washable-glue-sticks-disappearing-purple-2ct/-/A-17088980
Glue creates a small enough layer to allow you to remove the print... Interesting right. Works great with Ninja Flex as well.
2) When slicing your print, use a 5-10mm brim. This gives you something to get a hold of to get your spatula under when removing print.
3) Print
4) allow your heat bed to cool completely before removing print.
Good Luck!
RE: Too strong adhesion PEI sheet with PETG material
I am having the same problem with the PC sheet. Any solution for it since you should not use window cleaner?
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Chuck H
3D Printer Review Blog
RE: Too strong adhesion PEI sheet with PETG material
Have you tried the upside-down Dust-Off (rapid cooling) trick? I haven't printed with PC but assume it would contract differently than the PEI/heatbed.
RE: Too strong adhesion PEI sheet with PETG material
I've printed probably 30 kg of PETG on my Prusa I3 mk2 and is the only thing I print with. I've learned a few tricks that make taking prints off real easy.
When I print I have my heatbed set to 85C. When it finishes, removed the print from the print bed between 60C-70C. If the printed finished and the bed is already cold, preheat the print bed until it gets between 60C-70C for removal.
Buy some Talc powder of some sort and sprinkle just a tiny bit on the bed and wipe it off. One coating is good for usually 3 prints so you don't need to apply it every time. I forgot who recommended it but it works great. This is the stuff that I use. The temperature + talc powder makes a huge difference and the spatula and window scraper I use sometimes but not often... the spatula I do use a bit though.
A spatula tool that works well
https://www.amazon.com/gp/product/B017XGEDOM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Window Scraper blade to help lift model edge then I slide the spatula under the model. Be careful with the window scraper as it can dig into the PEI sheet, it's a good idea to round corners of blade with a file so its not so sharp.