I just gave PEHD a try and print a cooling spirale for an injection mold round core but unfortunately the print fail after 6 hours of printing out of 8 hours. PEHD does not stick to the print bed... I've tried clear packaging tape, Ultimaker adhesion sheet, saran wrap, 3D lac on a 85°C glass... Nothing seems to work with HDPE where I got some succes with PP...
If any one has some experience with HDPE please share.
In German section of this forum user DeerDingsda is currently experimenting with PE and HDPE but without any results yet. So go ahead and give it a try on your Ultimaker and report how's it performs as a 3d printing material. I'm curious, too.
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