Print speed in curves seems to not follow cura settings

[vincetastic 0]

Hi everyone.

I'm currently trying to tune the slicing settings for a pellet 3d printer and I have noticed something strange with the speed.

 

I set every kind of speed parameters on 40 mm/s and, as you can see on the picture Cura decides to print the tube way slower.

At first I thought that,given the fact that a curve is in made of numerous small segments, there was not enough length to reach the target speed with "normal" acceleration (1000 mm/s²).

So I tried increasing acceleration dramatically, as well as for the jerk control but nothing changes.

 

Does anyone know how Cura decides how fast it prints small segments? (small feature speed is 100% btw).

Is there a way to control it?

 

Thank you for your help ! :)

[gr5 2,170]

With small parts like this the speed is limited by cooling factors as the quality will get real bad if you print this too much faster.  You could print 2 at once and it will print probably just as fast as printing one and you will probably get better quality at the same time.

 

Anyway to answer your question you need to play with this setting:

Minimum Layer Time

 

If you cut that in half it will potentially double your print speed.

 

The color shown in cura ignores accel and jerk.  It's the "requested speed" that is inserted into gcode.  The printer itself decides what speed to actually print and can often/usually reach the requested speed within the limitations of jerk and accel.

 

[vincetastic 0]

Thank you very much gr5 for that quick answer !

 

Indeed cooling time might be a problem but I need to keep the same speed through the print.

Printing two at once is a great idea !  Tkank's!