diff --git a/readme.md b/readme.md
index 343faf2..4d88c3c 100644
--- a/readme.md
+++ b/readme.md
@@ -12,6 +12,7 @@
 - [Connect ELM327 with HC05](https://www.instructables.com/Arduino-OBD2-ELM327-I2C-LCD-HC05-Bluetooth/)
 - [Datasheet](https://cdn.sparkfun.com/assets/learn_tutorials/8/3/ELM327DS.pdf)
 - [OBD2 PIDs](https://en.wikipedia.org/wiki/OBD-II_PIDs)
+- [3D print housing with power switch](https://www.thingiverse.com/thing:1464425)
 
 ### FSC-BT836B
 - [Datasheet](https://www.feasycom.com/datasheet/fsc-bt836b.pdf)