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Ultimaker 3 - Print start warping 4 hours into print

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Hi guys,


Could some one eplain me why my prints start to warp severeal hours into to printing???

The beginning it was fine, no warp at all. now i see some corners starts to bend.

I print with Ultimakers black PC.


The lid of my box was completely closed, now I have opened it a little bit, to let som of the warm air out, fearing

that it was because it was too hot inside??


regards Nicolai



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I see you basically are posting the same question 2x, and I now see you do use a top cover... thats good. 

Again, I would try the adhesion sheets...





Ultimaker PC is not an easy-to-print material because it tends to warp and delaminate if the printing environment and settings are not perfect.

We strongly recommend using the adhesion sheets to achieve the best build plate adhesion when printing with Ultimaker PC. Alternatively, you can apply a thin layer of glue (included in the accessory box of your Ultimaker) to the glass build plate, but please note that adhesion with glue is less reliable than with adhesion sheets.




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Hi Nicolai.

Warp deformation is happening because different parts ot the printing piece have different temperatures.

You mentioned that you opened the door and let the cool air in to the chamber... This can cause warping 99% of the times..


Usually to keep temperature of the part more or less equal we use heated bed.


I would try to not open the door at all during the print since melting point of the whole part will never be achieved inside...


Happy printing!


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