11. Useful G codes - FLSun3dp/FLSun-Kossel-Mini GitHub Wiki

General G code information

G28 - Home

This commands purpose is to bring the effector up to your end-stops even when the position of the effector is "unknown".
Basically it sets a baseline from which the printer calculates movement.
With the RC8 version of Marlin there is a "Safe home" feature, which brings the effector down from the end-stops. The point of this feature is to allow effector movement in any direction from the "home" position.
This feature can be disabled via firmware: #define DELTA_HOME_TO_SAFE_ZONE
Just comment it out with //

It also possible to adjust the speed with which the effector goes to the end-stops.
Edit the line: #define HOMING_FEEDRATE_Z (100*60)
<100 = slower, >100 = faster.

G29 - Auto bed leveling

This command has its own section in the wiki.

G33 - Auto calibrate.

This command has its own section in the wiki.

G90 - Absolute motion of effector.

Example: G90 followed by G1 Z10 -> Effector moves down to 10mm above your Z-min.

G91 - Relative motion of effector.

Example: G91 followed by G1 Z-100 -> Effector moves down 100mm from current position.

M119 - Print out your end stop status.

This command is useful when troubleshooting end stops.

M500 - Save current configuration (which is stored in RAM) to EEPROM.

M501 - Load the EEPROM values and put it in RAM.

M502 - Load values from the firmware (firmware defaults) into RAM.

M503 - Print out current configuration values.

Very useful command to find your delta radius, diagonal rod length, Z-height and more.

M665 - Set delta configurations (Requires DELTA)

Usage: M665 H<x.x> L<x.x> R<x.x> B<x.x> S X<x.x> Y<x.x> Z<x.x>

```
H = delta height
```
```
L = diagonal rod
```
```
R = delta radius
```
```
B = radius for calibration points
```
```
S = segments per second
```

X = corr. for angle between towers Y and Z

Y = corr. for angle between towers Z and X

Z = corr. for angle between towers X and Y (auto adjusted so sum of 3 corr. = 0.0)

Example: Not available. Yet..

M666 - Set delta endstop adjustment (Requires DELTA).

Usage: M666 X<x.x> Y<x.x> Z<x.x>

```
X = x endstop adjustment (<=0)
```
```
Y = y endstop adjustment (<=0)
```
```
Z = z endstop adjustment (<=0)
```