Trigger calibration

Trigger calibration presses the Stage 2 switch up to 3 mm deeper, for printers that stop just short of it so Stage 2 never starts. Start small and watch the first run: the press goes past the printer’s usual highest point.

When you need it

Stage 2 starts when the printer presses the FarmLoop kit’s switch. On the Bambu Lab P, X and H series and on the Elegoo, Prusa and Snapmaker printers the bed moves down onto the switch. On the A1 and A1 mini the gantry rises into the trigger at the top. If the kit sits a fraction low, or the plate is a little thinner, the printer can stop just short:

The print finishes and the bed goes down to the switch, but there is no click.
The door does not open and the bender does not run: Stage 2 silently does nothing.
It happens on every print, not once in a while.

Check first that the switch sits flush in its holder: see Stage 2 activation issues. A loose switch moves during the print, and pressing deeper does not fix that.

Where to find it

In the FarmLoop app, in the Detachment tuning step: Tuning Parameters, then Trigger Calibration, under Heated Bed Temperature. On a phone it comes after Z Offset.

Plans: Pro and Business.
Stage 2 only: the setting shows while Stage 2 is switched on. Stage 1 bends the plate against a bar and has no switch.
Out of beta since FarmLoop 2.8: no Beta features switch needed.

What it changes

Animation, side view: the bed moves down from rest at Z243 to the standard press at Z255 and stops just above the switch's plunger. No click. — Left: the standard press stops short. Right: 1.5 mm deeper, the switch clicks. Example values for a Bambu Lab P1S. Not to scale.

Animation, side view: with trigger calibration at 1.5 mm the bed moves down from the same rest height to Z256.5, pushes the plunger in and the switch clicks. — Left: the standard press stops short. Right: 1.5 mm deeper, the switch clicks. Example values for a Bambu Lab P1S. Not to scale.

Every press of the switch goes deeper by the amount you set, from the first trigger to the last press that closes the door.
The rest height stays where it is, so the stroke gets longer instead of the whole movement shifting. On a P1S at 1.5 mm: Z243, down to Z256.5, back to Z243, instead of Z243, Z255, Z243.
Nothing else changes: not the rest height, not the Stage 1 bending, not the sweep.

As soon as the value is above 0, the app shows the new press height under the slider, for example: “Presses to Z256.5 instead of Z255 on every trigger.”

Setting it

The setting goes from 0 to 3 mm in 0.5 mm steps. 0 leaves the press as it is.

Check the switch sits flush in its holder.
Set 0.5 mm in Trigger Calibration.
Process the original sliced file again, not the FL_S2_ file you made before.
Watch the first run. Stay at the printer when the print ends: you should hear the switch click and see the door open.
Raise it in 0.5 mm steps only if the switch still does not click. The maximum is 3 mm.

Press heights per printer

Printer	Standard press	At +3 mm
Bambu Lab P1P, P1S, P2S, X1C, X1E	Z255	Z258
Bambu Lab X2D	Z260	Z263
Bambu Lab H2S	Z340	Z343
Bambu Lab H2D, H2C	Z325	Z328
Bambu Lab A1	Z256	Z259
Bambu Lab A1 mini	Z185	Z188
Elegoo Centauri Carbon, Centauri Carbon 2	Z255	Z258
Prusa Core One	Z273	Z276
Prusa XL, XL+	Z368	Z371
Snapmaker U1	Z266	Z269

The Flashforge AD5X has no Stage 2 kit, so it has no trigger calibration.

Over the Processing API

Business accounts send the same setting as triggerCalibrationMm, from 0 to 3. On Stage 1 it is ignored and the response says so in X-FarmLoop-Warning. See Processing API: extra tuning tools.