I need help with setting up a BLTouch

BismuthBlues

@Phaedrux said in I need help with setting up a BLTouch:

M558 P9 C"^zprobe.in" H5 F120 T4000 ; BLTouch connected to Z probe IN pin
M950 S0 C"exp.heater3" ; create servo/gpio 0 on heater 3 pin on expansion connector

I do have RRF3. I tried putting this in and when I click home z, the probe deploys but doesnt retract, and nothing else happens.

Thank you for your help, I really appreciate it.

BismuthBlues

@Phaedrux

When I click Home Z, the probe deploys but doesnt retract, and the printer gets stuck on the Z Home command for a while.

M401 and M402 do work like they should.

I am not sure what the servo control gcode is. I may be in a little over my head with this project....

When power is first applied, the BLTouch lights up red, and then deploys and retracts twice. After that, the BLTouch stays lit up solid red.

dc42

@BismuthBlues said in I need help with setting up a BLTouch:

When I click Home Z, the probe deploys but doesnt retract, and the printer gets stuck on the Z Home command for a while.

Please post your homez.g file.

BismuthBlues

@dc42 retractprobe.g; homez.g; deployprobe.g; config.g

Phaedrux

G90               ; absolute positioning
G1 X35 Y-17 F6000 ; go to first probe point
G30               ; home Z by probing the bed

G31 P25 X-20 Y32 Z0

In your homez you have the probe move to an odd absolute position based on your probe offset. Try changing it to move to the center of the bed.

BismuthBlues

@Phaedrux I made a change to it to move the head to the middle. The now head moves to the middle, deploys the probe, and then nothing happens. After a while, the probe gets retracted.

I am sure its just that I have no idea what I am doing. The Z-axis of my printer is like it would be on a gantry robot, I am guessing that I didn't configure it correctly, but I don't know what I did wrong.

Phaedrux

What do you mean like a gantry robot?

Does the z axis move at all?

BismuthBlues

@Phaedrux Sorry I was unclear. This is my printer: https://imgur.com/a/YOc4DmV. So the head moves up and down on the arm.

BismuthBlues

@Phaedrux Turns out, I am just really bad at math and gear ratios. The Z-axis is moved with some gears and belts, and I dramatically miscalculated the number of steps per mm for the z axis. I still need to figure out the math exactly, but once I increased it from 5 to around 200, it is working correctly.
Thank you for your help, and sorry for wasting your time...

Phaedrux

@BismuthBlues said in I need help with setting up a BLTouch:

@Phaedrux Sorry I was unclear. This is my printer: https://imgur.com/a/YOc4DmV. So the head moves up and down on the arm.

That's a very interesting printer. Is it a cartesian where the bed is stationary and the print head moves in X Y Z?

BismuthBlues

@Phaedrux Yes, it is! It's being converted from an old piece of lab equipment that didn't work anymore.

Phaedrux

Cool. I hope you post more about it.

BismuthBlues

@Phaedrux Thanks! Once it is up and working, I plan on doing a detailed write up with a fair number of pictures.