Changing print speed during printing

[bbrown64]

I print using Cura. I always set up the speed to print prior to printing. However, sometimes I want to adjust the speed during the print process. I can change the speed in the software. But the speed never changes at the printer. I was wondering if this is a common trait of the software/ hardware? Any suggestions would be appreciated.

[teicher]

This is normal behavior, the print speed in cura is simply the print speed setting that you wish to "embed" into the gcode sent to the printer. Once you have sliced the STL and sent the resulting gcode to the printer, you can't change it again w/o stopping the print and reslicing with the new print speed.

[RetireeJay]

If you use Repetier as your User Interface, you will be able to change the print speed at will anytime during the print. Behind the scenes, Repetier analyzes each line of G-code before sending it to the printer, and it can modify speed on the fly. It can also modify flow rate, Hot End temperature, and bed temperature dynamically without having to re-slice the model.

[PxT]

You can also do this with M-codes:

M220 - Set speed factor override percentage: S<factor in percent>
M221 - Set extrude factor override percentage: S<factor in percent>

So, for example, M220 S150 would give you 150% speed. You can use M221 if you find you are under / over extruding and want to change it on the fly.

[bbrown64]

Thank you everyone for the information. I will put this new information to good use.