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marlin-bed-leveling

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Calibrates Marlin 2.x 3D printer firmware bed leveling: Unified Bed Leveling (UBL), Bilinear ABL, M420 S1 post-homing, Z-probe offsets, G26 mesh prints, and EEPROM slots. Trigger phrases: marlin bed leveling, ubl calibration, m420 s1, z probe offset, g29 bed level, first layer adhesion.

When to use

• Calibrating, tuning, or troubleshooting automatic bed leveling on Marlin 2.x 3D printers (Ender 3, CR-10, Prusa clones, custom CoreXY / Cartesian machines).
• The user asks: "How do I set up UBL in Marlin?", "My printer homes with G28 and ignores the mesh", "Calculate BLTouch Z-probe offset", "Generate G26 validation print G-code", or "Edit warped mesh points with M421".
• Diagnosing first-layer defects: nozzle dragging across PEI sheets, corner detachment, uneven squish, or compensation disabling after homing.
• Sizing slicer start G-code sequences (Cura, PrusaSlicer, OrcaSlicer, Bambu Studio) with thermal soaking and mesh restoration.
• Calibrating Klipper or RepRapFirmware printers (different firmware syntax and mesh compensation systems).
• Fixing gross mechanical skew: loose V-slot rollers, bent Z leadscrews, or wobbly gantry arms (hardware faults cannot be solved by software leveling).
• Delta printer kinematics setup requiring radius and tower endstop adjustments before mesh probing.

When not to use

• Marlin commands and mesh behavior vary with firmware version, configuration, probe, bed geometry, and slicer. Check the exact firmware build and printer documentation before applying a macro or offset.
• G-code can move a hot toolhead and damage equipment or cause burns. Supervise calibration, keep hands clear, use the printer's emergency stop when motion is unsafe, and verify travel limits before running generated sequences.
• Example coordinates, temperatures, tolerances, and fade values are illustrative; measure the actual printer and follow the manufacturer’s limits.

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