5 model

Free

HC-SR501 Pir Motion IR Sensor Motion Detector.

Thingiverse

Free

Audio Technica ATH-SR50 BT Headband Attachment Replacement

Printables

Free

CASE for HC-SR501 Passive Infrared Sensor PIR

Thingiverse

Free

PIR sensor case with universal mount (HC-SR501 )

Thingiverse

Free

Master volume knob Onkyo TX-SR501E

Printables