It just occured to me that if RepRapFirmware doesn't support M900, then any results I get by printing **K Factor Test.gcode** are invalid! The gcode simply draws lines back and forth, with each new parallel line increasing the K valueβ¦ except using M900 instead of M572. Would it be wise to adjust the gcode for RRF, replacing M900 K10 with M572 S0.10 for example? Or does M900 work?

```
[[gcode]]
M900 K10
G1 X80 Y30 E0.37418 F1200 ;Travel to next testline
G1 X60 Y30 E0.74835 F1200 ;Slow part
G1 X30 Y30 E1.12253 F4200 ;Accelerate - cruise - decelerate
G1 X10 Y30 E0.74835 F1200 ;Slow part
M900 K20
G1 X10 Y40 E0.37418 F1200 ;Travel to next testline
G1 X30 Y40 E0.74835 F1200 ;Slow part
G1 X60 Y40 E1.12253 F4200 ;Accelerate - cruise - decelerate
G1 X80 Y40 E0.74835 F1200 ;Slow part
```

Full source: https://gist.github.com/anonymous/988a04f4454cbcdec78ae7342894fdd6