And Back to getting my Two Trees Sapphire Plus working

[Martin_au]

yeah a flat bed is definitely rthe better option.
The problem with the sapphire plus - is that it has 2 z-axis motors.
So keeping the bed flat without any lateral slant is going to be difficult.
In that case an 'auto levelling' system will actually help level a slanted bed.
And given that even a few hundredths of a mm slant will make a difference - it's probably worth using the bl touch.

getting a print bed lined up properly on a dual z-axis printer is always going to be bloody difficult.
That's the main reason, that if you don't need the extra build volume - the sapphire pro2 is the machine to go for over the sapphire plus.

Although how accurate those bl-touch clones are - who knows ;-)

The sapphire plus may include independent z drivers and dual endstops (though that is version dependant). That should make tramming the bed very simple using either g34 and the bltouch, or the endstops.

However, I’ve seen some comments that the firmware it comes with doesn’t work properly with dual endstops. Looks like there’s quite a few people making marlin builds to resolve this.