Cat Laser with 18650 battery and build-in charger.
thingiverse
Shopping list: * Laser module 5V: http://s.click.aliexpress.com/e/bWKxX4XO * Li-ION charger with 5V booster: http://s.click.aliexpress.com/e/ce5RolTK * 18650 battery: http://s.click.aliexpress.com/e/HBKzlrw * Tact switch: http://s.click.aliexpress.com/e/b7oreFdI Grab some epoxy glue too. Print all parts at .2 or .3 resolution, no supports needed. Remove the USB port from the charger, solder the battery and laser to it, then stick everything together with glue - done!
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