A bed leveling test prints small squares or patterns at key positions across your print bed. By examining each printed square's quality — its thickness, adhesion, and surface finish — you can determine if your bed is properly leveled. Uneven squares indicate that the nozzle is too close (thin, rough patches) or too far (poor adhesion, gaps between lines) from the bed at that location. This tool generates STL files with customizable test patterns so you can quickly diagnose and fix bed leveling issues.

5-Point: Fastest — checks four corners and center. Great for quick verification.
3×3 Grid (9 Points): Most popular — provides good coverage across the entire bed. Ideal for daily use.
4×4 Grid (16 Points): Detailed — catches subtle unevenness. Recommended for large beds (300mm+).
Full Bed Layer: Prints one thin sheet across the entire bed. Best for detecting warped beds or overall flatness.
Concentric Squares: Tests consistent extrusion at varying distances from center. Good for checking frame squareness and belt tension.

After printing, gently peel each square off the bed and inspect:
• Smooth top surface with no gaps = perfect nozzle distance
• Rough, ridged surface = nozzle too close (Z offset too low)
• Gaps between lines, poor adhesion = nozzle too far (Z offset too high)
• Square won't stick at all = bed too low or dirty at that spot
• Square varies in thickness = bed not level (tilted)
Compare squares from different locations — they should all look identical on a properly leveled bed.

Use 0.20mm for standard 0.4mm nozzles — this is the most common first-layer height and gives clear feedback on nozzle distance. For finer nozzles (0.25mm), try 0.12mm. For larger nozzles (0.6mm+), use 0.28–0.32mm. A single layer is sufficient — the test is meant to be fast and use minimal filament. The key is consistency: all squares in the test should have the same layer height, so any visible differences are due to bed level, not slicer settings.

1. Download the STL file from this tool.
2. Import it into your slicer (PrusaSlicer, Cura, OrcaSlicer, etc.).
3. Important: Set the first layer height to match the "Layer Height" value you chose here (e.g., 0.20mm).
4. Ensure the model sits flat on the build plate (Z=0). If it appears above the plate, use the slicer's "Drop to bed" function.
5. Slice and print. The test typically takes 3–15 minutes depending on the pattern.
6. Use a brim or skirt if you have adhesion concerns, though the squares themselves usually stick well on a clean bed.