3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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Scrub the bed with dish soap and a non stick scourer, dry it right away. Then print on that. Ipa only removes oils from your fingers, there's other residue it won't remove
This definitely looks like a bed cleanliness issue. IPA doesn't really remove oil, it mostly just spreads it around. Soap is needed to lift the oils off the surface. You shouldn't need a scourer, just a paper towel works fine.
I always use a fresh paper towel when washing my build plates in the sink, because I figure only Bel-Shamharoth himself probably actually knows whatever the hell might be all over the dish sponge, nor how old it is. Did it get saturated with bacon grease this morning? Is it full of grit just abrasive enough to fuck up my kapton tape? Who knows.
And if that doesn't work, use pure acetone (warning, this idea puts knots in peoples panties - frankly it's fine to do if you don't make a habit of it) or try a gluestick (the specialized ones for 3d printing are worth it, don't steal your kids art supplies)
Use pure acetone only if you know with 100% certainty that it won't eat whatever polymer your build plate is coated with. You don't have to worry if you use a glass build plate, though.
It does eat the pei sheets a bit, but that's good to even out tiny marks and dings in the sheet. Like the previous poster said. It's fine to do once in a while to refresh the surface, spring steel sheets are consumables anyway.
For PEI