Different speed settings, same print speed

[arhifane 2]

Hello,

I've done two testing prints, same object but different speed and layer heigth settings: 0.06mm and 40mm/s vs. 0.2 and 100mm/s.

I observed that on certain areas, even the settings are different, the printer is moving the same (and i'm not talking about the first layer).

Is it normal that the printer itself decide to use a certain speed on some areas?

Which are the factors that affect this?

I may post two videos regard that.

Thanks,

Stefan

 

[nallath 1,117]

Just because you tell it to go at a certain speed, it does not mean it's able to get there. The printer has an acceleration setting, so if the segment it's printing isn't long enough, it won't reach the speed (as it also needs time to de-accelerate).

Don't be fooled by claims about speeds that a printer can reach. In most cases it won't ever reach them due to these constraints.

 

[DidierKlein 729]

Also check your minimal layer time if you set it to 0 it won't slow down on smaller parts

 

[dirkdirk 5]

I think you are talking about the minimum layer time. Default is 5sec. So If your layer is very short, Cura will slow down the speed to assure the next layer is not lay down too fast (5sec)

[arhifane 2]

Thanks for the quick and firm answer. Yes, the minimum layer time was set to 5sec. When i repeat the tests i will confirm the result.

I think the acceleration was not the problem, as long as the "faster" area was "H" shaped while the slower one war a rectangle (same size, smaller primeter).