⬢ The fifth LED near the right edge will start flashing. Prusa Mk3 Bed Level/First Layer Test File by Punkgeek. And if that doesn't do the trick, you can send an inquiry to I tried my best making the best looking, while still useful calibration cube so it doesn't land in a wastebin right after being printed. I tried a new filament - it is still leaking through the nozzle (because when it does the initial 9 spot check you'll see little blobs) but it hasn't been affecting the print quality. Cubes were printed on mks3+ in Hatchbox 1. Print the cube repeatedly, measuring and adjusting the x, y and z firmware settings until you home in on the precision you expect.
