You place the object on the bed where you want it printed. You do not change printer home position. Home position is invariant and always the same. Slicer add a coordinate offset depending on position on bed.
In printer settings you can define what home means for your printer (min/max/0).
If your bed changes height I hope you have z max homing.
We have a variable bed coating that can adjust z=0. Works also for z min but z min endstop must be deepest position so it will crash into bed for higher beds, whcih is why z max is then better. Also it might work with spring loaded beds.
You shouldn't do this. Your lowest Z should be just enough room that the printer can make its first layer. any closer and you'd squish your head and bed together.
That said though if you really want too, "M851 Z-n.nn" will let you.
Also, if you don't have enough spacing between the bed and nozzle, you WILL clog your printer. The melted filament will travel up the heat break and then solidify again. If that happens and you can't use the Atomic Method to clear, you will most likely be manually cleaning out your hotend.
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