So got a question guys, I am running an ender 3 Pro with BTT e3 v2.0 board. if I run the pre compiled firmware for it here, everything works perfectly. My problem is I want to customize it a little and if I build it in the firmware builder the printer does not home properly. X and Y home correctly but Z does not. I am selecting the option to use bl touch port as the pre compiled firmare uses the same port instead of the z min port. I just don’t understand what is changing, any help would be much appreciated.
Same problem with latest version downloaded Ender 3 with SKR mini e3 v2.
When homing z axis it just goes up, probe in the air and gives STOPPED.
I see there is no way to go under 0 (negative) in Z axis movement too.
I’ll ask the same question again - before it says STOPPED, does the probe extend, then retract twice?
This is what Marlin does when it cannot detect the state of the probe changing. When Marlin can’t detect the state of the probe changing, it cannot tell when the probe hits the bed, and the STOPPED is preventing the head from slamming into the build plate and damaging your nozzle or the bed - or both.
Unless you have a one-of-a-kind board, it wasn’t a problem with the pin allocations.
It’s likely that you had the wrong port selected for your setup. The BLTouch can connect to two different spots - depending on what cable you have. The Z-Stop port, or the PROBE port.
For the firmware to know what port to listen on, you need to tell it the correct port you have the BLTouch connected to.
The PROBE port is the 5 pin header - and normally is with a 5 pin cable. The Z-Stop is most frequently used when your BLTouch has a 3 pin and a 2 pin connector on it.
You can however use the 3+2 pin cable in the 5 pin header with a bit of modification.
It’s always better to use the PROBE port if you can - as its direct to the MCU without filtering, and therefore more accurate.
