Really interesting stuff. I don’t know if everyone already knew about all this except me or what. I am still learning and this is really useful information. Until now I had no idea that you could tweak things like this to get better overhangs.
I see you wrote 21 mm3/s on there. Is that a good general volumetric flow rate for PLA? Right now I am using 18.
That’s just the normal flow rate for Bambu PLA Basic. I was going to try a tad lower but didn’t get around to it yet.
Is there anything special about Bambu PLA that allows that flow rate or could any PLA handle that flow rate? Or maybe it can’t. Haha. I am going to try it I guess.
I have yet to try non-Bambu filament (not that I think it will be any problem with it, I just have tens of kilos of Bambu’s) but I’m sure there are other brands as good as theirs. Just do the Orca calibrations for speed and temperature, I guess. Or simply try to print faster, verifying in the slicer preview that you are indeed flow-bound. The generic profiles are naturally moderately tuned so they work for most anything.
I’ve used a fair bit of Inland PLA+ as well as a couple others and can usually reach similar speeds without much of an issue. It will vary by brand like @the_Raz said though and the best way to find that number is to do the orca calibrations.
So, using all the information you all gave, I’m giving the roof another try at the moment, with 0.08mm layers and the default 0.42 line width.
I was wondering whether the speed you use for the printer as a whole has en effect.
Apparently it does, as I started at “Normal” but noticed that spaghetti appeared as well as defects on the “tiles” of the roof itself. So I quickly switched to “Silent” and it seems this works better. Though it obviously doubles the time needed to print then thing.
I would try to make the roof solid so it prints bridges and not overhangs. I think this would work.
How did it work out?
Thanks for asking!
Not too bad, except that there was some stringing at the beginning, so the base is not really “clean”. Besides I had to add a 1-layer raft to maintain everything in place. I guess it was because of the normal speed. When reduced, it printed out fine.
At least the roof printed ok.
But gluing it to the rest of the house will probably not look perfect.
Glad you pretty much got it worked out. When I glue parts together I use superglue and it usually is relatively seamless. I would think in your case it should come out looking pretty good. Were you able to print the rest of the house OK? Because it looked to me like it had some serious overhangs in some places.
I had to stop the printing the very first time when the printer sent a message about spaghetti. Hence my decision to try and cut the roof.
I have not printed the house again, thinking that by cutting the spaghetti, I could then glue the roof onto it. But it did not come out as neat as I thought it would be.
I guess I’ll have to give it another try, this time reducing speed to “Silent” mode.
As for the overhangs on the house, it was acceptable.