Frame the workspace
Place the camera with a clear view of the printer or work area and keep the browser page active. Use a Watch zone around the area that matters.
Exclude routine movement
Add Ignore zones for a doorway, window, or other changing background. Tune the threshold after seeing the live meter so routine changes are less likely to alert.
Motion detection, not diagnosis
Rapid Cactus detects movement. It does not diagnose print failures or decide whether a print is successful.