Hi, this a case for Arduino Nano (Chinese Version) based on this project : http://www.thingiverse.com/thing:880427. I rebuild the case entirely from scratch adapted to fit screws and nuts and seemless plugin with PLA, the nano will slide right into place without any effort. The version in the link (printed in PLA and in my printer i3) will not fit the nano without pressing it to hard, and the the pieces need to be sanded on the joining parts also. Added the top part. Later i will post images on the full assemblyJust Slide the nano V3 (Chinese Version) into the slot :) The Nuts are for 2.5mm Screws As this was a first test, the printed quality is low because i used a 0.3mm Layer Height