Where to change the default printing speed?  

RE: Where to change the default printing speed?

Posted by: @prusanewuser

Hi, sometimes when the authors posted their files on the internet and suggested setting a default printing speed to X mm/s value, where in PS should we change to match the recommended default printing speed? I see there are lots of speed settings in the software. Not sure which one corresponds to the default printing speed.

If you want to adhere to the recommendations, just make sure no speeds exceed the suggested speed. In general, slower printing equals better quality, so there's usually no problem printing a bit slower than recommended. 

Also, on the LCD panel of the i3MK3, what speed in mm/s does 100% corresponds to?

Rotating the knob while printing is the same as issuing the M220 Marlin gcode command. It is used to speed up or slow down the feedrate (speed) used for all X, Y, Z and E (extruder) moves. It is a percentage of whatever speeds are specified in the gcode being sent to the printer.

Be aware that if you change this value during a print, it will be retained for all subsequent prints unless you reset it or cycle power on the printer.

RE: Where to change the default printing speed?

@bobstro

Thanks. So if at the beginning of the print I go to Tune and set the speed to X%, the movement of X, Y, Z axes and E will be increased or decreased (depending on whether it is greater or smaller than 100) to X% of the original values set in these parameters? So if in PS the speed for X, Y, Z and E are set to 10, 100, 1000, 10000 respectively originally (just an example for simple calculations), if I set the speed to 80% at Tune, the speed of motions for X, Y, Z and E will be 80% of whatever values originally set for these parameters in the PS. That is, they will be 8, 80, 800, 8000 mm/s?

I can understanding doing it this way can increase or decrease the motion of along the X,Y and Z aces. What does this affect the speed of E extrusion?

RE: Where to change the default printing speed?

Posted by: @prusanewuser

[...] So if at the beginning of the print I go to Tune and set the speed to X%, the movement of X, Y, Z axes and E will be increased or decreased (depending on whether it is greater or smaller than 100) to X% of the original values set in these parameters?

Yes, that is correct.

[...] I can understanding doing it this way can increase or decrease the motion of along the X,Y and Z aces. What does this affect the speed of E extrusion?

It will affect the E (extruder) axis as well, which is one of the downsides to doing it this way. In general, I like to keep my movement rates separate from my extrusion settings. Reducing the external perimeter speed makes the biggest difference in print quality. I use 25mm/s if finish is important. Perimeter speeds and top surface are next. So long as you don't exceed your maximum volumetric rate the hotend is capable of with your specific combination of filament, nozzle, and settings, the other features are less critical. Setting the Maximum volumetric speed (MVS) setting is a good way to throttle maximum speeds. This ensures that the speeds you specify for each feature type will be used up until they result in excessive MVS which can cause skips and jumps. Only those extrusions that need to will be throttled. This gives you a lot more repeatable, granular, and precise control than twiddling with the front knob.