You can see where around corners and even some straight runs it is peeling up. I’m running first layer at an agonizing 15 mm/s. Using hatchbox pla filament, just dried in dehydrator. 200° nozzle and 70° bed. The glass is freshly cleaned with soap and water, I just did several atomic pulls, I’ve trammed at different heights using a feeler gauge, and absolutely nothing is working. Any one have any ideas?

  • CaffeinatedMoth@lemm.ee
    2·
    10 months ago

    Many suggest adding some type of adhesive to the surface, and I have a trick that might interest you. Glue sticks and hairspray are messy and are a pain to clean. When I used a glass bed, I kept about a tablespoon of sugar dissolved in little less than a cup of water nearby. One could use a paper towel to wipe a thin film over your glass bed. I did this as it warmed up and the water dried quickly, leaving a thin tacky surface. One could put it in a small spray bottle too. Very easy to clean with water. If you eventually get buildups after weeks of printing, a quick wash with soapy water cuts through instantly. Give it a try. I could never get PLA to stick to my glass bed. PETG worked sometimes, and other times it bonded too well and broke the glass when it was removed, or cooled to the point of removing. The sugar water worked there too in providing a sacrificial layer that protected the glass and made removal easier.

  • Grass@sh.itjust.works
    1·
    7 months ago

    Those lines dont look flat enough to me. https://ellis3dp.com/Print-Tuning-Guide/articles/first_layer_squish.html

    The guide is largely klipper oriented but has marlin instructions after the klipper instructions.

    Other than that I’ve tried some samples of bed adhesion aid of different brands which help for printing some of the bullshit filaments that stick to literally nothing and they are much less messy than hairspray or glue and most didn’t smell awful, but I haven’t found them to actually be necessary for anything other than the really slippery filaments.

  • scotticus42@lemmy.nz
    1·
    10 months ago

    Hey man, your first layer isn’t getting enough squish by the looks of it. It likes a decent amount of push into the bed compared to some other materials. PETG doesn’t like as mush mash down as PLA. So if your printing PLA, try increasing your squish. You can do this via your z offset.

    But do you really need your bed at 70? Mine runs and sticks just great at 60. 70 seems a bit warm for pla, as it keeps it just a bit too close to the glass transition temp for my liking. But if 70 has worked for you, then stay there.

    But as another suggested, maybe raise your first layer temp by 5 or 10 and see if that helps. It might be that it needs a bit higher temp to flow better.

        • BingoBangoBongo@midwest.socialOPEnglish
          0·
          10 months ago

          I was able to get it printing, but doing some calibration confirms that adjusting z offset made the bottom layer better. What’s the point in z offset specifically, vs just changing the gap when tramming or the initial layer height?

          • p1mrx@sh.itjust.works
            1·
            9 months ago

            If your printer has a touch sensor, then raising/lowering the entire bed has no effect on the first layer. The Z offset defines the difference between the touch point and the first layer.

            I think most people calibrate the Z offset for 0.2 mm, and then never change the first layer height.

            Edit: oops, this thread is a month old.