This is a pair of almost identical casings for throwies which fit together in several different ways and allow easy access to the LEDs so that it is easier to replace any dead battery. This was designed in tinkercad and printed using a MakerBot. I used 6x3h,10d=m, 2x6.5d,1m=m, Li3V coin cell 5mm LEDOnce you download the STLs and print out the pieces glue some magnets into the holes left for them (I used 6 magnets with a diameter of 10mm and a height of 3mm and for the smaller magnet holes I used 2 magnets with a diameter of 6.5mm and a height of 1mm) be very careful about which side you glue the magnets down on and make sure before you glue in the magnets that the magnets on the two pieces attract each other. Once the magnets have been glued put a LED taped to a coin battery into the two slots (I used a two Lithium 3V coin cells for batteries with two 5mm LEDs)