Marlin 2.1.2.4 for SKR Mini E3 V3.0 STM32G0B1RE with BLTOUCH for Z homing

[Seelenkind]

Requirements

SKR Mini E3 V3.0 STMG0B1RE with BLTOUCH

Description

Marlin 2.1.2.4 for SKR Mini E3 V3.0 STMG0B1RE with BLTOUCH for Z homing

Benefits

Firmware upgrade Marlin 2.1.2.4

Related Issues

actual firmware for SKR Mini E3 V3.0 STMG0B1RE with BLTOUCH

[Seelenkind]

Firmware upgrade Marlin 2.1.2.4 for SKR Mini E3 V3.0 STMG0B1RE with BLTOUCH

[bcat]

Thanks for this! I am using it on my Ender-3 Pro with a CR Touch, and it seems everything works well! I'll likely want to build my own firmware to make some configuration tweaks soon, but it's nice to have a pre-built one to get up and running quickly. :)

Some notes for other folks who are trying it out:

• Creality's stock 5-pin CR Touch cable has the correct pin layout for the SKR Mini E3 V3, and with this particular firmware, it's not required to split out two of the pins for the Z endstop connector. Just connect the 5-pin cable directly from the CR Touch to the mainboard and leave the Z endstop disconnected. Homing and probing should work correctly out of the box.
• Of course you have to customize the Z probe offset, but make sure you do this right away, as an offset of -1.85 is set by default, which may be (way) too much for your probe and nozzle combination. So check this immediately to avoid driving the nozzle into the bed.
• The X and Y offsets are less critical, and the stock ones were pretty close, but you may as well set those too. (It's a one-and-one thing, unless you're radically changing your hotend or probe mount.)
• If @Seelenkind is still making changes to this PR: It'd be nice to build with PROBE_OFFSET_WIZARD and ASSISTED_TRAMMING_WIZARD, which really help with setting the Z offset and tramming the bed using the probe, respectively. (It might also be safer to build with a default Z offset of zero rather than a negative one, but maybe that's excessive paranoia.)

[ldswofford]

I am somewhat new to updating/marlin/BTT/bltouch/etc. I have updated an Ender-3 S1 with the BTT SKR Mini E3 V3 board. I have that working (somewhat using the initial Bug-Fix firmware that came with the board. I have now added a BL Touch (3D Touch) to the board, using the board's BL Touch connector(s), not the z-stop connector/with bltouch pins. I have been unable to get the original canned firmware from Github for the ender-3 bltouch to work correctly (won't move to center on autohome), so I updated to this Marlin 2.1.2.4 for SKR MINI E3 V3.0, etc...that has the z-homing... The issue is that when autohoming, the probe test doesn't stop and ends up being all the way down on the bed and making 'the bed noise'. I have made changes to the -1.85 z-stop setting in the config as far as up to +2.5 and the probe still never stops the nozzle from hitting the bed. (yes, I test/save/reboot/etc and have reloaded the firmware to reset everything).The comment above from bcat, makes it sound like no changes are needed and this firmware will work for both using z-stop, or using the board's bltouch 5 pin port for everything, leaving the z-stop connection empty... is this true, or do I have to modify the 3d touch plugs to create one to install in the z-stop connector? Or... do I have to modify the firmware options to disable the z-stop connector? Thanks