Marlin Ho0w To Get Cr Touch To Probe In Grid

Marlin How to Get CR Touch to Probe in Grid: A Comprehensive Guide

Meta Description: Learn how to configure your Marlin firmware to enable grid probing with your CR Touch auto bed leveling sensor. This comprehensive guide covers the necessary steps and troubleshooting tips for a perfectly level print bed every time.

Getting your 3D printer bed perfectly level is crucial for successful prints. The CR Touch auto bed leveling sensor simplifies this process, and using grid probing with Marlin firmware offers even greater accuracy. This guide will walk you through configuring your Marlin firmware to leverage the CR Touch's capabilities for superior grid probing. We'll cover everything from the necessary configuration changes to troubleshooting common issues.

Understanding Grid Probing

Before diving into the configuration, let's understand why grid probing is superior to single-point leveling. Single-point leveling only accounts for the bed's level at a single point, leaving potential inconsistencies across the entire print surface. Grid probing, on the other hand, measures multiple points across the bed, creating a mesh of data that the printer uses to compensate for imperfections. This results in a much more level print surface and significantly improves print quality, particularly for larger prints.

Necessary Marlin Firmware Adjustments

Configuring Marlin for CR Touch grid probing involves several key adjustments within the configuration.h file. Remember to back up your current configuration before making any changes!

1. Enabling CR Touch Support:

Ensure that the following lines in your configuration.h are correctly set:

#define CR_TOUCH
#define AUTO_BED_LEVELING_GRID

2. Defining Probe Points:

You need to specify the number of points the CR Touch should probe. This is usually determined by the size of your print bed. A common setup uses a 3x3 grid (9 points), but you can adjust this based on your needs. This is done by modifying:

#define AUTO_BED_LEVELING_GRID_POINTS 3,3 // Adjust as needed for your bed size

3. Setting Probe Offset:

The probe offset defines the distance between the CR Touch probe and the nozzle. This is crucial for accurate probing. You'll need to carefully measure this distance and insert it into the configuration:

#define CR_TOUCH_X_OFFSET 47 // Replace with your measured X offset
#define CR_TOUCH_Y_OFFSET -5  // Replace with your measured Y offset
#define CR_TOUCH_Z_OFFSET 2 // Replace with your measured Z offset (may need adjustment)

These offsets are highly dependent on your specific printer setup and the physical location of your CR Touch. Incorrect offsets will lead to inaccurate leveling.

4. Z-Probe Configuration:

Adjust these parameters to fine-tune the Z-probe behavior:

#define Z_PROBE_REPEATABILITY_TEST // Perform test to ensure accurate readings
#define Z_MIN_PROBE_START  // Adjust starting Z height for probing
#define Z_PROBE_SPEED // Set the speed of the Z probe

Experimentation might be needed to find optimal values here.

Compiling and Flashing the Firmware

Once you've made the necessary changes, save the configuration.h file and compile your Marlin firmware. After successful compilation, flash the new firmware to your 3D printer's control board.

Troubleshooting Common Issues

• Probe Fails to Connect: Double-check all wiring connections between the CR Touch and your motherboard. Verify that the correct pins are used and that there are no shorts.

• Inaccurate Leveling: Incorrect probe offsets are the most common culprit. Carefully remeasure the offsets and re-compile/flash the firmware. Consider performing a manual bed level adjustment after the auto-leveling to fine tune.

• Firmware Compilation Errors: Carefully review any error messages during compilation. They often indicate issues in the configuration file.

Conclusion

Configuring your Marlin firmware for CR Touch grid probing significantly enhances your 3D printing experience. By following this guide and carefully adjusting the configuration parameters, you'll achieve a perfectly level print bed, leading to improved print quality and fewer failed prints. Remember to always back up your firmware before making any changes. Good luck!