Input shaper

Definition

Input shaping (Klipper, some Marlin builds) measures the printer’s resonant frequency with an accelerometer and cancels ringing by splitting each move into timed impulses. Higher frequency usually allows higher acceleration. Longer shapers (EI, 2-hump EI) stay effective over a wider band of frequencies but smooth corners more, so Klipper’s suggested accel is lower than for ZV at the same hertz. The calculator reproduces that suggestion; it does not replace resonance testing.

Calculators that use this

• FDM calibration & firmware

  Input Shaper Max Acceleration

  Reproduce Klipper’s suggested max_accel for ZV, MZV, ZVD, EI, 2-hump EI and 3-hump EI from the shaper frequency, with its 0.12 mm smoothing target, square corner velocity and damping ratio.

• FDM core & costs

  Print Time Estimator

  Estimate FDM print duration from path length, print/travel speed, acceleration and jerk treated as junction velocity. Trapezoidal moves, metric millimetres or inches.