Bridging Distance Calculator (Pre-Failure Check)

Predict if a bridge is likely to sag or fail before running a long print.

Bridge risk

61 / 100

Risk result

High risk

61 / 100

  • Predicted max bridge25.8 mm
  • Requested / max ratio1.08x
  • Estimated sag at span0.48 mm

Recommended actions

  • Shorten bridge span by reorienting part or adding a support blocker only under the span midpoint.

FAQ

Can this replace bridge calibration prints?

It is a pre-check, not a replacement. Use it to avoid obviously risky spans, then verify with a quick bridge test for your exact printer and filament.

What helps bridges most for PLA and PETG?

Lower bridge flow, moderate bridge speed, and high fan on bridge layers usually give the biggest improvement.

Why does ABS still fail long bridges even with tuning?

ABS stays soft longer and benefits less from high fan, so long unsupported spans sag earlier than PLA under similar geometry.

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