My supports are unraveling. Worse - some of the “tree” trunks are not even printing, whilst the rest of the model is printing rather nicely. At the top of the support, where the support and part meet; it’s a total train wreck.
P1S
Using Bambu Studio
PETG filament from Inland (Microcenter); YES - I have dried it to ~20% or less humidity. When I first put it in my drier it was 32%
I’ve tried making 5 of these to no avail
IMPORTANT NOTE: I am doing manual support and painting dots all across the overhang area
The dryer’s humidistat readout is telling you the humidity of the air inside the dryer, not the moisture content of the filament. The air humidity only loosely correlates with the moisture content of the filament. So your numbers don’t really say much. What matters for drying is time and temperature, the dryer’s humidity reading is really just window dressing, not of any significant value. In fact, the dryer’s humidity level will drop in proportion to the increase in temperature after you turn it on. So within a few minutes the humidity reported by the dryer’s gauge will drop rapidly even though the filament hasn’t released any of its moisture at all.
So the question isn’t “did you dry?” but “what temperature did you use and how long did you leave it in the dryer?”. For PETG, the answers are 70ºC and a minimum of 12 hours. Ideally 24.
Assuming you’ve done a flow and PA calibration, all the other slicer defaults should work fine. If they’re not working, the odds are much better that your filament is the cause rather than any of the slicer’s settings. I print PETG all the time using the slicer defaults for supports, no problem. But whether I think my PETG is dry or not dry, it goes in the dryer at 70ºC for 24 hours prior to printing.
Thanks for the suggestion. I see where, in the slicer software, to set the speed for sparse infill… but where can you set the speed of the support trees?
