Do you really have a .35 nozzle? Stock nozzle is .4mm. I agree with didier. In order of importance:
1) Slow to 35mm/sec or even 20mm/sec for absolute highest quality.
2) Lower to 210C or even 200C if you go 20mm/sec
3) Shell thickness needs to be multiple of nozzle to get good quality. Also 2 passes comes out much better so do .7mm shell/wall thickness.
4) Increase travel speed to 150mm/sec or even 300mm/sec. The faster the better to break the strings and decrease the time where the nozzle isn't extruding. The biggest problem with Ultimaker is it doesn't print as well when you speed up or slow down the printing and during travel the extruder is stopped yet you still get some slow leakage. So minimize this by speeding up travel time.
5) Set infill speed to 0 so that it matches shell speed. With 2 passes on the shell this isn't critical because extrusion flow has time to adjust while printing the inner shell. In other words this setting might not affect quality.
6) Retraction should be 4.5 if the bowden is not moving at all on either end. If it moves when you pull up on it at the head then this should be even higher - perhaps 5.5. This setting affects stringing and you aren't getting any so it probably doesn't matter on this part. That loop on the leg is something else - possibly slow travel speed problem.
7) Fill density=50 seems very very high. I think you will find that 24% is plenty and it prints much faster at 24% than 25%. Again this doesn't hurt quality - just makes it print slower if at 50%.
8) You should print with a brim (drop down in basic settings). I assume your parts aren't falling off the bed but still - without a brim you are asking for trouble (parts get knocked off bed).
retraction_min_travel = 1.5
retraction_minimal_extrusion = 0.02
I would set those to zero. There's a small chance the minimal_extrusion parameter caused that loop on the leg. It might not have retracted because it didn't print .02mm worth of filament (which is something like 4mm printing travel).
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DidierKlein 729
Hi,
Maybe print slower and cooler? I would get down to 220°c or less and 30mm/s to 40mm/s for this kind of print.
And another thing (not sure if it has something to do) but it's recommended to have the wall thickness as a multiplier of your nozzle size so for you 0.35mm, 0.7mm etc ... (not 0.5mm)
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