Marlin Motion Related Configuration.h Settings for MakerFarm i3v

[printbus]

Some general info for those just starting to look at the motion settings...

1. Watch the units. Assuming metric, g-code F parameters for feed rate on G1 commands are in mm/minute. Most of the Marlin settings are in mm/sec. Slicer units vary. I like the way some of the Marlin source code has the values for mm/minutes entered as, for example, 2*60. That helps one realize/remember that the setting is 2mm/sec, multiplied by 60 to come up with the value in mm/min.

2. Watch out for EEPROM settings. ABL folks are well aware of this issue, but if you have EEPROM enabled you can run into issues seeing the effect of changes you're making in source code. That's because the old EEPROM values will be used for settings even though you've loaded new firmware into the printer's flash memory. To update the EEPROM settings after a firmware upload, you should send the printer an M502 command to load the variable space with data from the firmware build, and then an M500 to have Marlin copy those variables into EEPROM.

3. Repetier-Host users, note the EEPROM access available through Config | Firmware EEPROM Configuration once RH is connected to the printer. This provides a way to view, edit and restore EEPROM data without having to browse through the LCD or deal with gcodes.

4. Mapping between configuration.h motion settings, the settings under the LCD control | motion menu, and settings via gcode is as follows:
HOMING_FEEDRATE {X,Y,Z,E} is not in the LCD menu tree. M210 in gcode but not supported in our Marlin.
DEFAULT_MAX_FEEDRATE {X,Y,Z,E} is Vmax x, Vmax y, Vmax z, and Vmax e on LCD. M203 in gcode.
DEFAULT_MAX_ACCELERATION {X,Y,Z,E} is Amax x, Amax y, Amax z, and Amax e on LCD. M201 in gcode.
DEFAULT_ACCELERATION is Accel on LCD. M204 S in gcode.
DEFAULT_RETRACT_ACCELERATION is A-retract on LCD. M204 T in gcode.
DEFAULT_XYJERK is vxy-jerk on LCD. M205 X in gcode.
DEFAULT_ZJERK is vz-jerk on LCD. M205 Z in gcode.
DEFAULT_EJERK is ve-jerk on LCD. M205 E in gcode.
DEFAULT_AXIS_STEPS_PER_UNIT is Xsteps/mm, Ysteps/mm, Zsteps/mm and Esteps/mm on LCD. M92 in gcode.

5. Note in the above list that every constant with a DEFAULT prefix also has a gcode associated with it. The DEFAULT label simply implies that will be the value used by the printer until it is superseded from the LCD or a gcode command.

6. There is a code limitation that kicks in when trying to use the LCD panel to edit the Amax z parameter. The code assumes the user will be selecting a number beginning with 100 and incrementing/decrementing by 100. Unfortunately, the MakerFarm default for Amax Z is 5. With the code the way it currently is, once you bring up the Amax Z screen, the value changes to 100 and you can't return it to 5. Stay out of the Amax Z menu item unless you want to adjust the value in increments of 100.

7. There's an order of precedence to some of the settings. DEFAULT_MAX_FEEDRATE sets the upper speed limit for the printer. Faster feed rates specified in MANUAL_FEEDRATE, HOMING_FEEDRATE, or a gcode command will be limited to the setting in DEFAULT_MAX_FEEDRATE. Only a new firmware build or the LCD will allow you to set a higher feed rate.