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I have the Creality CR-10S. I replaced the glass it originally came with as it was warped and I wasn't getting any material out on 2 of the sides.

I switched to a PEI sheet and got the same results after only a few prints.

I then switched to a mirror I had cut previously, and it worked for maybe 2 days. I scrapped a print off that warped, and then the leveling was off on that. My gantry is level, my beds aren't warped, I'm leveling it to allow a standard piece of paper to have friction by the head. It's either to close and no filament is extruded or it doesn't stick at all and drags filament everywhere. If I can get good extrusion on one side, it's horrible off on the other or all corners.

Note that I have checked my gantry and it is straight as well and my the bed. Not sure what issues I have left.

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    $\begingroup$ Maybe you did create a mesh in printer's EEPROM memory with a previous warped bed, and now still using these settings unconsiously? $\endgroup$
    – octopus8
    Mar 11 '21 at 8:10
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    $\begingroup$ Maybe you can post an image of a leveling print, e.g. this cross hair, you get a bonus to see if it prints in the center also! $\endgroup$
    – 0scar
    Mar 12 '21 at 9:43
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Be sure that you have no previous bed meshes saved and automatically applied: use the commands M502, M500.

Once you have done that, try this technique:

It's about using a ruler to detect areas which are lower, and then use stickers below the glass to thicken those areas only, resulting in a much flatter surface.

If you don't want to use the blue tape (which will worsen the heat transfer, but not so much after all) you could use 0.3 mm silicone thermal tape, which is more heat conductive but it's also quite thicker than blue tape.

This other alternative consists of flattening the plate itself, but it's inevitably performed when cold, while the tape technique above can be performed at the desired temperature (since the warping may not be constant).

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  • $\begingroup$ The downside is the extra layer of air between the heated bed and the glass. Doesn't this prevent effective heat transfer? $\endgroup$
    – 0scar
    Mar 12 '21 at 14:26
  • $\begingroup$ @0scar well it's tape not air, but surely there is something in between. I update the answer. It's a matter of priority. $\endgroup$
    – FarO
    Mar 12 '21 at 15:26
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    $\begingroup$ If you insert tape, although very thin, it will create gaps on either side of the tape, air is a good insulator, hence my concerns. :-) $\endgroup$
    – 0scar
    Mar 12 '21 at 15:46
  • $\begingroup$ What should the mesh look like and how do I access them to see? $\endgroup$
    – Jester0153
    Mar 13 '21 at 10:14
  • $\begingroup$ @0scar it is true but I think it won't matter. I found in YouTube cases where small squares of silicone thermal pads were used at corners and center. They left way bigger gaps and still it didn't matter much. $\endgroup$
    – FarO
    Mar 13 '21 at 18:12

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