adjust flow rate on the go

[Odense3DPrint]

Does anyone know if its possible with a command to adjust flow rate on the go with repetier firmware?

[MindFuLL]

http://reprap.org/wiki/G-code#M221:\_Set\_extrude\_factor\_override\_percentage
^Let me know if you don’t know what to do with this and I can assist further.^
-Jesse