what do you think of this ?
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in my eternal quest to have the best print setting what do you think of this ? the change of color is due to change of speed from 30 to 60mm wanted to check something, printed in vase mode transparent petg at 215-220C .25mm high
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In my experience that temperature is rather low for petg. I've had much better results 240-245c
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@JamesM the stuff him using they recommend between 200 to 240 , it depend of the brand
at those temps it already oozing out easily
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@Dad003 That phenomenon was exploited by someone a couple of years ago. He very cleverly wrote custom slicer software or post processing software, and produced parts which had visible images, like faces and the like. I don't remember much more about it but it was all done by varying the speed iirc.
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@deckingman
That's cool! A single wall lithopane...
I'd also modify extrusion rate to the darker areas.@Dad003 I remember, printing similar parts to get the best transparency. I even created the opposite effect, and the PETG looked like ice. Maybe I've kept some of the parts and show you. But for sure, I don't remember which settings where necessary.
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I think they called it velocity painting
https://www.youtube.com/watch?v=HdKaKKeyz7g&ab_channel=ThomasSanladerer
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I have found that with some transparent PETG I have, the print surface quality is highly dependent on print speed. It seems to be a function of the time the filament spends in the hot-end.
When I print at 250C at "normal" speeds 30-50 mm/sec, the prints come out with a surface that shines like glass, and is as clear as glass (in a single wall). If I print at 15 mm/sec, the plastic bubbles a lot as it extrudes and I get a frosted look that isn't so shiny or transparent.
I don't think it indicates moisture in the filament because at 250C, moisture would boil off at any speed, and it behaves this way even when the filament is fresh out of the package. I think it may be some chemical decomposition of the plastic. This particular filament has some bluing in it to make it look like old coke bottle glass under normal light, and makes it fluoresce a pretty pale blue color under black light. It still glows whether it is printed clear or frosted, so it doesn't seem to be the bluing that getting boiled away.
I'm going to try printing a striped vase that alternates between the clear glass mode and the frosted look...
Vase on left is frosted by printing at 15 mm/sec, others are like glass, printed at 30 mm/sec
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That's interesting. I don't think I've ever tried to change the "frostiness" of PETG with printing speed, but I frequently exploit that so-called transparent PETG printed with no cooling fan is much clearer than PETG with the fan turned on.
(I usually print PETG at 235C.)
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@garyd9 I print without a cooling fan and get glass at 250C, 30mm/sec (I'm printing with a 1 mm nozzle on a volcano hot-end, 1.2 mm wall thickness, 0.6 mm layers.) That 600 mm tall vase printed in less than 9 hours!
