Rotator Cuff - too much extrusion on corners or overhangs

[davidwood]

@Orias

Are you using a fan? ABS or PLA? If PLA you’ll really want to install a fan. Your prints will improve tremendously. Ideally the fan would blow on the top couple of layers of the printed object, not just on the nozzle as some mounts are trying. You’ll find that it may not be too much extrusion, but when it’s printing in air it’s not cooling fast enough. It can get pulled back in when the print head moves back. It’s hard to tell without seeing your gcode file/Slic3r config.

Thank you for replying!

Printing with PLA. I did build and install a fan. See Taz fan mount! - would love your comments on the adequacy of this particular fan mount or any suggestions for a different one. I fear anything attached the nozzle will spend as little time on that drooping overhang as the nozzle itself does. Which is to say, very little at all. Have also tried larger fan aimed at the print bed - results not good.

In terms of gcode or slic3r config - I have about 20 attempts. I’ve attached an example. I tried all kinds of things, and got all kinds of dramatic variations in the print, but never to those sloppy overhangs. I did not try enabling supports. Since this is designed to print an interlocking part, I was afraid the supports would get into the spaces between the rings and mess it up. Can give it a shot, though.
bracelet_0.5 v14.ini (2.86 KB)
Rotator_Cuff-XXL - v15 - slowed way down to 30mm, all accel disabled, 2.82 filament diameter, 1 extrusion multiplier.gcode.zip (2.89 MB)