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Need help with G29 command

Posted by MikeCL

MikeCL

Need help with G29 command
April 24, 2019 01:37PM

Registered: 5 years ago
Posts: 45

I have a auto level probe but when I do a G29 command it sends my nozzle off the build area and not in the center where I would rather it find the first home for the Z.. I'm not sure if the bed size in Marlin is not right (Anet A8 with ramps 1.4) but I can't seem to get this one.

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MikeCL

Re: Need help with G29 command
April 25, 2019 10:34AM

Registered: 5 years ago
Posts: 45

Anyone know?

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MMcLure

Re: Need help with G29 command
April 25, 2019 06:13PM

Registered: 6 years ago
Posts: 265

Have you enabled Z_SAFE_HOMING in Configuration.h?

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carvedblock

Re: Need help with G29 command
April 26, 2019 07:24AM

Registered: 5 years ago
Posts: 3

I feel like much more information would be useful.

As @MMcLure mentioned, safe homing could cause this, but the default for safe homing is actually center... (bed size/2 in both directions)

- Firmware version (And some context. Are you flashing your own firmware, what version, etc?)
- Ideally, upload your configuration.h

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MMcLure

Re: Need help with G29 command
April 26, 2019 02:27PM

Registered: 6 years ago
Posts: 265

For something like an A8 you should define your bed with something like this:

#define X_MIN_POS -33
#define Y_MIN_POS -6
#define X_BED_SIZE 220
#define Y_BED_SIZE 220

leave pretty much everything else that refers to the bed alone. You'll probably have to fine-tune X_MIN_POS and Y_MIN_POS a bit, but those numbers should get you close.