I dunno how OP did it but you can override your machine's normal travel limit parameters in your slicer settings. Often the nozzle can physically travel further than the bounds of the build plate and is actually limited by hitting its rail endstops (or limit switches!) or striking some other part of your machine.
My Qidi can position the nozzle about 20mm beyond all four sides of the plate before it hits anything, but on the left and right sides it needs to be above z height 10mm or so to clear the Z axis gantries, and at the front and rear it's just empty space. So you can't print on the bed in that area because there is no bed. But if your object were shaped as such you could put overhangs out there in no man's land. It would be risky, perhaps, but you could.