After spending a lot of time fixing my taco bed, I’ve now run into a problem I can’t seem so solve.
My overhangs (and bridges) are terribly droopy. The standard profiles in Orca are a complete mess. After spending a lot of time with calibration, it’s gotten better, but the results are still “unusable prints”.
Now at this point, I’m at my wits end. All calibration tests (temp, flow, retraction, PA) are fine, printing the “screw” on my Bambu yields a perfect result. Filament (Sunlu Pla+ white) is bone dry and in a dry box.
Am I missing something? Is there anything else I can try? Or is my nozzle broken/head broken and I’m just waisting my time?
I’m open to all suggestions then can help fix this mess, thank you in advance.
It’s not a cooling issue. Fan is set at a 100%, and verified to blow. It feels to me a bit like my layers are too thin for their height. I did a test print of the screw at 0,12mm layer height and the result looked a lot better, no droopiness. But it takes close to double as long, and with the size of the SV08, printing always at 0,12mm height is not really an option.
Thicker layer needs MORE airflow to solidify before is sags. I’ve not seen anyone else with a SV08 complaining about cooling but for whatever reason you need more cooling. Fan may not be hitting rated speed due to bearing drag or high electrical resistance.
OR lower your parameter speed.
Lowering nozzle temp will reduce sags too but may impact layer adhesion and/or surface smoothness.
Last week, I did some test bridges (https://makerworld.com/en/models/43725-bridging-test-5-to-100-mm?from=search#profileId-45011). Lowering the speed didn’t bring any benefits. Setting it higher than the base speed at 60mm/s improved my results a lot. Any lower speed, I get a “droopy hang” for like 4 mm, followed by a straight line when the filament “stabilizes”. I’ll print another bridge test to add a photo.
Below the same print, left at 0,20mm layer height at default settings, right at 0,12mm height with my after-calibration-settings. Both run at 100% cooling.
Today’s bridge vs a shorter screw with overhangs. Overhang is a catastrophe.
For the bridge:
5mm and 10mm are perfect.
20mm is good enough imho.
40mm would do in a pinch, but that’s already a looooong distance.
60mm to 100mm is not great, but I wouldn’t expect anything else.
