So I did some testing with greentec (high temp bio filament) and before i tried anything I did all the usual calibrations: 21 m3/s max flow; 1,005 flow factor; 99,73% xy and 100,27% z shrinkage; low to medium-high cooling; …
due to the recommendation from the manufacturer i started with lowish bed temps of 47C, Nozzle temp of 217C and a flow of 17 m3/s - prints without brims failed. ramped up the bedtemps to 65C - the same prints stuck well without brim. tried a bigger more complex multipart print: everything warped as if it was abs…
will try 75C bed, +5C nozzle temp, 16 m3/s, lower cooling 17% -> 7% turning it off if layertime is > 50s, force overhang cooling 100% -> 85% fan speed, maybe i’ll add a brim…
do you think it is a good plan or are these too many changes at once? i’m not sure if lowering or hightening the nozzle temp, will be better, any idea?
do you have any experience with greentec on unenclosed bedslingers or otherwise?
Guenther_Amanita@slrpnk.net 14 hours ago
I have some experience, but with the GreenTec PRO. I don’t know if you have the same, or if it’s another thing.
The GTP is a composite material, meaning it’s made of at least two different polymers. IIRC it’s PLA (or something very similar) and Lignin, which gives it the heat and mechanical resistance.
I had the experience that it behaves quite the opposite of ABS or other warping prone materials. Usually, slower cooling (enclosure, high bed temp, low fan speed) means less warping.
But GTP was different. I had way less warping when I increased the cooling fan (max) and decreased the bed temp to around 50°C.
It should solidify as soon as it comes out of the nozzle in my experience.
BenSim@lemmy.ml 6 hours ago
Thank you that’s good insight! I also thought that maybe it would behave more like pla in the cooling and solidifying regards. Changed PLA manifucturer. Settings were a bit too hot for the new spool and had warping on the first larger part.
GreenTec (basic) is like a not so stiff first iteration of their special material mix. It has a high notched and unnotched impact resistance, lower youngs modulus, lower softening temp, and more elongation at break than GTP. You can think of it like the difference of PETG to PET where PETG is the basic Greentec.