This is a super simple case designed for the Jaycon USB flashlight kit.
Recommended minimum print settings: 0.2mm layer height, 100% infill, 3 shells.
Print time (0.2mm layer height, 100% infill, 3 shells): approximately 1h15m.
This flashlight is an awesome project for learning to solder. If you are interested in making this flashlight then check out the website of the manufacturer and consider buying their kit. It's super simple to build and only takes a few minutes. Checkout the link below.
http://www.jayconsystems.com/batteryless-flashlight-solder-kit.html
Thanks to Jaycon for the fun kit.
Notes: The button is designed to be held in place by some small pegs. All you should have to do if it is printed correctly is press on the button hard enough and it will crack the pegs and allow you to use the button. Depending on how you print it they may or not print correctly. The best way to print it is with a raft and with the LED end of the case aimed down into the board and support on. This will hold the button in the correct place and should only print support inside the indent for the LED. Support is also recommended for the rear cap of the light. The best way to print that should be pretty obvious. Good luck!

I have included both the original AutoCAD files that I made and an STL file for each part so that you can print your own without having to export it from AutoCAD.
To make the model I just used basic shapes and the solid subtraction tool. It was super easy and I would love to see someone build upon what I have designed.