This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/bbCyYTVkRR5

This thing is a case for a USBASP AVR ISP programmer such as http://www.electrodragon.com/product/8051-avr-mcu-programmer-usbasp/

There is a window for viewing the two LEDs, and a relief dent for the crystal. If your USBASP has the crystal in a different position, you will need to edit it and move it to the correct place.

There are no latches. The best solution is to use a little hot-glue to hold the case to the USBASP board.

The thin rectangle beside it is to waste some material while my cheap printer figures out how to control the temperature; feel free to take it out on any remixes.