After printing cpllaz excellent Pulse Rifle model, I decided I needed a Motion Tracker as well. This is the updated version, it is much closer to the original movie prop.
I haven't printed this yet, but I've preview printed it in the UP! software and there are no errors, but please make sure you check on yours.
I have supplied a mesh of the complete tracker as well as breaking it up into pieces, but depending on the size of your printer, you will probably need to cut it up before printing.
It will need a strap added to the handle, philips head screws, cables for detailing and various graphics, but there are plenty of reference photos on line.
The dimensions for the full size Motion Tracker are 28cm, 22.5cm, 18cm.