First, I didn't do anithing to this design. It was made by Esquilo. and I found it on thingverse: https://www.thingiverse.com/thing:994827
There you can find more info about this design, and he made also other cases.
By him suggested printingsettings:
The screws for the Arduino board are #2 x 1/4" thread rolling screws.
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Step 1: Step 1: Download the Files
now you have to download the files, to 3D print you will need the arduino uno snug case, but if you want them apart i will upload them to.
Step 2: Step 2: Print It
say to the printer that he has to start.
Step 3: Step 3: Respond
don't forget to thank the origInal designer.