Mk3 Extended Maximum Bed Test
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The Mk3 firmware limits the X axis range to 0 to 255mm and the Y axis to -4 to 212.5mm. The negative Y area is usually used for the purge line.
We can adjust PrusaSlicer and allow a model to use the additional Y area. The Bed Shape Y size is set to 216.5mm, and the Y origin to -4mm.
If your left side doesn't print correctly (lines overlap), you may also need to set the X origin to -1mm. See https://github.com/prusa3d/Prusa-Firmware/issues/2768
I also disabled the skirt, moved the purge line, and made an alternative “skirt”. The G-code I used is:
G1 Z0.2 F720G1 X5 Y60 F1000 ; go to an unused area of the bedG92 E0G1 Y120 E9 F1000 ; intro lineG1 Y160 E12.5 F1000 ; intro lineG92 E0G1 X10 F1000 ; move right slightlyG1 Y60 E3.13543 ; 100mm normal extrusion instead of a skirtG92 E0
The model is 250×216.5mm.
A similar method could increase the maximum width, though note this print is already very close to the edges of the steel sheet. My sheet is 253mm wide.