TOM bed leveler

thingiverse

To check TOM (Tilt, Out of Roundness, and Warp) on your MK7 extruder bed, follow these steps. First, print out two plates, drill 3mm holes, and insert screws with a compression spring for downward pressure. Next, assemble the arm by removing tabs and attaching it to the extruder mounting plate. Heat your bed to working temperature and use the control panel to lower the z-axis until the nub on the arm hits the bed while raising slightly. Move the bed to a corner and adjust using 50mm jogs to another corner, ensuring proper three-screw leveling. The index isn't calibrated but the end of the arm indicates movement. This method worked well for my machine and confirmed flatness after double-checking with a machinist's gauge.