MakerGear Forum

dfwspeed wrote:What changes would have to be made for those of us with a Z max endstop? Having trouble getting this to work

Would love to know this as well. Anyone have any input on this. I've updated my Rev E firmware based on the steps here, and would be happy to share once I get the Z Max figured out.

I'm waiting on my BL Touch to come in, but I;m getting everything ready for it.

tks546 wrote:Here's my first attempt at a mount. I haven't printed it yet just roughing it in.

-Tom

blt1.PNG

blt2.PNG

would you be willing to share your 3D Native File of the mount?

Just to report back in, I ended up getting this to work.

Rev E Machines the only change for the different endstop is as follows:
#define Z_HOME_DIR -1

Unfortunately I did not fully understand how to work with it, in terms of setting the proper gap.

I am not sure if the nozzle to bed gap is controlled by M206 or M851, so I really could not get proper adhesion to the plate, and honestly gave up for the time being.
If anyone has any additional information to share on the process of the setting the end gap with the BL Touch I would love to read about it.

I just got the BL Touch working.

I also thought I needed to do , but Marlin would prevent me from moving the bed down after I homed the Z axis. This told me the z-axis was upside-down.

what I really needed was this:
I also had to change steps per unit, and if you did what I did, you saved wrong values for this to the EPROM when you saved the bed gap offset.
It took me a long time to figure out that I needed to do M502.

Here is the mount I made, and some spacers to adjust the height of the sensor:

https://www.tinkercad.com/things/dPwQaw ... ling-maimu

https://www.tinkercad.com/things/3HE28r ... ch-spacers

leothecool wrote:I just got the BL Touch working.

I also thought I needed to do

Code: Select all

#define Z_HOME_DIR -1

, but Marlin would prevent me from moving the bed down after I homed the Z axis. This told me the z-axis was upside-down.

what I really needed was this:

Code: Select all

#define INVERT_Z_DIR true

I also had to change steps per unit, and if you did what I did, you saved wrong values for this to the EPROM when you saved the bed gap offset.

Code: Select all

#define DEFAULT_AXIS_STEPS_PER_UNIT {88.88, 88.88, 88.88, 400, 471.50}

It took me a long time to figure out that I needed to do M502.

Here is the mount I made, and some spacers to adjust the height of the sensor:

https://www.tinkercad.com/things/dPwQaw ... ling-maimu

https://www.tinkercad.com/things/3HE28r ... ch-spacers

I gave up on this before I saw your post. Going to try your mount and spacers and add that code and I'll report back!!!

I installed a BLTouch and I can get it to work as expected, but during the second/slow probe, the pin drops and strikes the bed as the bed doesn't seem to drop enough to give the probe enough clearance to deploy. I can only imagine this will result in an erroneous reading.

Anybody else having the same issue? I have been through Marlin too many times to try and adjust how much the bed drops for the fine probe, but I can't seem to find the settings. Any input would be appreciated.

Those of you who got it working, how do you like it?

cheers,
c

ryaneb85 wrote:I installed a BLTouch and I can get it to work as expected, but during the second/slow probe, the pin drops and strikes the bed as the bed doesn't seem to drop enough to give the probe enough clearance to deploy. I can only imagine this will result in an erroneous reading.

Anybody else having the same issue? I have been through Marlin too many times to try and adjust how much the bed drops for the fine probe, but I can't seem to find the settings. Any input would be appreciated.

I don't have that problem, for what its worth. I would double check to make sure the z axis steps per unit are correct for the z axis motor you have.

Z_HOME_BUMP_MM in Configuration_adv.h

Marlin apparently uses the same value for all Z-axis moves, whether they're homing or bed probing.

ksevcik wrote:Z_HOME_BUMP_MM in Configuration_adv.h

Marlin apparently uses the same value for all Z-axis moves, whether they're homing or bed probing.

Awesome, this looks like what I need. Will give it a try tonight and let you know how I get on.