After a couple weeks of printing with PETG-HF here is an update of my impressions. As others have mentioned the interlayer bonds of PETG-HF seems to be much weaker than standard PETG at the default settings. It also seems a lot more brittle with a lower shear factor even against layer lines. I have raised the temperature for the Green PETG-HF to 265 degrees and the interlayer bonds seem to be stronger (without any threading). I really love the surface texture which to me appears to be in between a gloss and a CF matte finish. I have printed at sports mode and ludicrous mode without any issues, I guess this is the point of high flow materials. I usually use PLA for support interfaces with PETG but I was getting a lot of spaghetti failures. My current theory is the temperature difference between the PETG-HF and the PLA Basic creates a lot of PLA oozing. My fix for this is just to use the same PETG-HF filament for the supports and the support interfaces (this also dramatically speeds up the print jobs, no filament changes). I set the ‘Top Z Diffrence’ to .3mm and my supports fall off cleanly and no spaghetti. I have experimented with white, red, yellow, and green materials.
I would love to hear other’s impressions of these new PETG-HF materials, especially what works for you optimal print temps and speeds…
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