* R[xxx] Wait for bed current temp to reach target temp. Waits when heating and cooling
* M200 - D[millimeters]- set filament diameter and set E axis units to cubic millimeters (use S0 to set back to millimeters).
* M201 - Set max acceleration in units/s^2 for print moves (M201 X1000 Y1000)
* M202 - Set max acceleration in units/s^2 for travel moves (M202 X1000 Y1000) Unused in Marlin!!
* M203 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec
* M204 - Set default acceleration: S normal moves T filament only moves (M204 S3000 T7000) im mm/sec^2 also sets minimum segment time in ms (B20000) to prevent buffer underruns and M20 minimum feedrate
* M205 - advanced settings: minimum travel speed S=while printing T=travel only, B=minimum segment time X= maximum xy jerk, Z=maximum Z jerk, E=maximum E jerk
