I wonder what the effect is of heating the glass bed (or whatever else bed material) on the warping? Heating creates two temperature gradients in the plate: one from the center (hottest) to the outside (coolest) which is about 10°C in my tests; and one from the bottom to the top. I think both might contribute to warping, and cause the edges to curl up?
Further, since glass is a non-crystaline material if I remember well, it slowly deforms over time. Like honey that is sagging, or like asphalt, although thousand times slower. So repeated heating cycles and clamping cycles might also have an effect, as well as storage after production if stored on a non-flat surface or vertically.
@mendells: Maybe you could repeat those measurements with both a cold and warm glass, and then after cooling down again, for all the glasses you have?
If you could find ceramics like those used for high-grade computer chips and CPUs, dark brown, these might be more stable? I don't know if "ceramic glass" like used for cooking plates are real ceramics (=baked clay), or rather a commercial name for a different type of heat resistant glass (although non-ceramic)? Real ceramics should have a very small thermal expansion and be way stiffer than glass.
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bastienb 12
Hello @mendells !
So, what about this new glass ? Would you have the contact for your reseller ?
I also have troubles with my glassplates... Either it's already warped when I buy it (UM ones) or it gets warped through time (printing / freezer / printing / freezer twice a day for months). I better understand why Josef Prusa got rid of the glass !
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robinmdh 106
this is one of the reasons why the bigger S5 has multi-point active leveling, it really makes a lot of difference.
Those anodized aluminum build plates for the S5 turn out to be even harder to get flat ?
With glass buildplate suppliers some batches of build plates we had have been outside of specifications for sure! I'd still prefer the safe tempered glass to the flatter standard glass IMHO.
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