Andrew Seaford

Goal
The goal of this procedure is to draw a simple box 10x10mm.

Relevant
Marlin 3D Printer Firmware running on Arduino Mega with RAMPS 1.4 shield. Controlled via Pronterface.

Procedure
The procedure below is a simple gcode example that will show how to draw a simple 10mm box.

1. Create a text file with the following code. In this example, we will call the text file box10x10mm.g
   
   G91
G1 X10
G1 Y10
G1 X-10
G1 Y-10
2. Open Pronterface
3. Click the Connect button, to connect to the device.
   
   
4. Click the Home button, to home all of the axis.
   
   
5. Click the Load File button.
   
6. Select the file created in step 1.
   
7. Click the Print button.
   

Symptoms
CNC machine homes in the wrong direction.

Relevant
Marlin 3D Printer Firmware running on Arduino Mega with RAMPS 1.4 shield.

Procedure
The direction of travel when homing is configured in the configuration.h using the settings X_HOME_DIR, Y_HOME_DIR and Z_HOME_DIR in the section ENDSTOP SETTINGS.
A value of -1 will set the homing direction towards the min end stop. A value of 1 will set the homing direction to the max end stop.

In the example below the homing direction for the z axis will be changed to home towards the max end stop.









The Z home value was -1 and has been changed to 1.