metal detector
thingiverse
I used a small metal detector electronics kit from ebay and a 3v button cell battery holder. the case was printed in 7 parts and slots together fairly snug. however a bit of glue would give added security. a great little device that really works. .
Download Model from thingiverse
With this file you will be able to print metal detector with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on metal detector.