UlrichC-DE 115
I also have this problem. However, I only know it with printers that are in the cold. If the objects are large and higher than one cm.
Therefore I had explained it in such a way. The object cools down faster in the cold and contracts against the thermal expansion. The contraction varies depending on the material. And the greater the temperature difference, the greater the effect.
In addition, there is a kind of leverage effect at cold temperatures. Because the object does not cool down evenly, but in the upper area first. The residual heat of the plate and, in particular, the lack of air circulation between the plate and the object prevent uniform cooling. As a result, the surface of the print object cools down and contracts. The edges are torn from the plate and the walls and structures of the object act as levers.
Because the plate is still warm at the time and there is good object adhesion, it cracks.
At warmer temperatures, the effect is diminished. Even if you take the plate out of the printer immediately after printing, or even put it in the refrigerator, the effect is not as strong.
-
1
Recommended Posts
bearsfeat 0
This is quite odd - for me - in that I have been printing on my UM3 for several years (about 4 - maybe 5? time flies) - and I just this week started seeing this.
I have printed maybe 90% PLA over this time, I have printed only one full spool of CPE about 2 years ago. I have printed maybe a half spool of ABS and about three weeks ago started printing PETG for the first time. After my 2nd full spool of PETG, I got significant glass delamination (tagging for searchers: glass peeling, cracking, chipping, separating)
I use hairspray exclusively and always have. I have finished my PETG project for now and an currently printing PLA again. I offer you no help, only solidarity. Hopefully someone picks up on his thread and offers a cause / solution. (It is the cause that has e baffled.)
Link to post
Share on other sites