Calibration Tool

Tolerance & Shrinkage Calibrator

Print a calibration cube, measure it, and get exact flow-rate and clearance corrections so MegaSlicer pegs always snap together.

1. Measure your test cube

Slice and print a 20 mm calibration cube at 100% scale, no horizontal expansion. Use digital calipers and average X and Y on the same layer.

Nominal cube size (mm)

Measured X (mm)

Measured Y (mm)

Current flow rate / extrusion multiplier (%)

Hole calibration (optional)

Designed hole Ø (mm)

Measured hole Ø (mm)

Material

Suggested flow rate

100.0%

Adjust your slicer's Flow / Extrusion Multiplier.

XY shrink/expand

+0.00%

Average over-extrusion

Horiz. expansion

0.00 mm

Set in slicer (negative)

Peg clearance

0.00 mm

Shrink male alignment pin by

Hole clearance

0.00 mm

Expand female socket by

How to apply

Open your slicer (Cura, Orca, Bambu, PrusaSlicer).
Set the suggested flow rate and reprint the calibration cube.
If still off by more than 0.1 mm, repeat with the new flow rate.

Tip: Resin printers shrink during cure. For resin, the calculator returns a negative XY compensation that you set in your slicer's Pixel Compensation field.

Why your pegs don't fit

When an FDM nozzle lays down a 0.4 mm extrusion, surface tension and over-pressure push it outward by 0.05–0.15 mm. That bulge accumulates on outer walls and shrinks holes. A 6 mm peg becomes 6.15 mm; the matching hole becomes 5.85 mm. The resulting 0.30 mm interference is enough to lock parts before they seat.

MegaSlicer Pro applies a default 0.20 mm clearance to every keyed cut. Use this calibrator to dial it in for your printer specifically — once your flow rate is correct, every Slicer Pro export will fit cleanly.