***NOTE*** I've since applied Bill's fix and it works great for reaching the switch beyond the firmware's normal range limits... so see his answer below!
I use the Creality 3 V2 and one issue I've run across with the BLTouch leveling firmware I am using is that it limits x and y axis travel to 220 mm and yet the BLTouch leveling routine slews to the extremes of both x and y axis, thus interfering with the switch used to control filament changes.
Given that bed leveling routine is only done at the start of a print I figured one alternative to trying to find and/or compile another version of the firmware with extended limits would be to put a momentary push to open bypass switch inline with the green wire from the limit switch. I generally observe the first layer being printed anyways and so it wouldn't be that big of a deal to press a button that disconnects the signal wire (green) returning from the switch during the bed leveling routine.
Anyways, that was my thought on how to get past the issue. I may need a high value pull-up resistor between the red and green wire and perhaps a small capacitor to avoid a floating signal line and switch bounce.
Has anyone else running a BLTouch used this method?
Edit: Think I may have a similar yet more elegant solution that uses a single momentary SPDT switch and cutting the Normally Open connection on the bigtree-tech switch board. That way I'm reusing the existing pull-up resistor and capacitor on their board. I'll take some photos of the mod when I have it complete.
Oh, I understand what you're saying... I didn't catch that you're using my hack. If you're only able to print at 220, why not just put the switch at 223 instead... no need to go all the way to the end if you can't actually print there. Then you can use our default settings... of 220... which will stop at 217... then you double it, which when we move to 220, will actually go to 223. The switch mount included with the kit will work there.
The other option is to upgrade the firmware to the TH3D or Community versions which allow full travel.
Bill