I bought the Adafruit Space Invader pendant but I didn't want to just dangle a PCB on my neck, so I made this. You can follow the project on Adafruit's site for all instructions for the electronics. Just print this case off and put it together. Beginner-friendly. Print the battery holder with supports. Print everything else without supports but you may need either a brim or printing disks (put these at the pointy parts) because of the sharp corners (which may pull up off your bed if it's not heated). Top and bottom snap together but you'll need a couple of small screws and nuts for the battery holder. Optionally, change out the JST connectors for something more rational. Finally, I made mine without a switch and just programmed it to loop forever.To get it back apart, just squeeze the bottom part and pry it apart. Program your Gemma before you put it together and you won't ever have to take it apart (provided you've used alternative JSTs) unless you tire of the animations.To ensure proper orientation, mount it so that what would normally be the necklace part if you were just dangling the PCB is pointing towards the small necklace holes, or away from the big battery hole. The big battery hole goes at the bottom. There is enough room inside so that if you don't get the wire lengths quite right, it'll be fine. You may need to stick one piece of wire underneath the opposite side of the backpack so that it sits evenly (you'll understand when you do it).The circuit board assembly will move around slightly, especially if you push it in. You can stop this by taping it or putting something non-conductive behind it, or just readjust as necessary.
Emerald Cut Ring - STEP / IGES,STL,Rhino - 3D CAD model - GrabCADgrabcad.com
Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5–8 on the Mohs scaleEmeralds are fascinating gemstones. They have the most beautiful, most intense and most radiant green that can possibly be imagined: emerald green. Inclusions are tolerated. In top quality, fine emeralds are even more valuable than diamonds.The unique look of the emerald cut diamond is created by the step cuts of its pavilion and its large, open table. Instead of the sparkle of a brilliant-cut, emerald cut diamonds produce a hall-of-mirrors effect, with the interplay of light and dark planes. While less fiery, the long lines and dramatic flashes of light give the emerald cut an elegant appeal. The shape was originally developed for the cutting of emeralds, thus the name.
Kind of a 747. Print this at the highest resolution you can because the wings and tail feathers are pretty thin. Airliner Pendant  by ocminimoto  is licensed under the Creative Commons - Attribution - Non-Commercial  license. http://www.thingiverse.com/thing:531562 http://www.thingiverse.com/ocminimoto http://creativecommons.org/licenses/by-nc/3.0/