I made this mount, to hang a magnetic sensor to our garage doors and wired up the sensors to the GPIO inputs of a beaglebone. It senses when the door is open and sends me a txt. The magnet was mounted on the part of the door that travels along the belt/track. I tapped and screwed the magnet since the double stick tape lasted all of 5 minutes.
I did have to play around with the scaling to get it to fit my installation. The G-code contains notes on the X,Y,Z scaling factors.

Printrbot

Simple White

No

No

.4mm

30%

2 perimeters
2 top/bottom solid layers
Speeds - 60mm perimeters, infill 50mm, travel 130mm, first layer 75%
1.75mm PLA 199 degrees C
no fan first layer
used slic3r to slice the design