It is common to have an Arduino connected to a circuit on a breadboard. This 3D print allows the Arduino and breadboard to be attached to a common base which provides a lot of stability for the project.
A lot of breadboards come with an adhesive pad on the back. The Arduino is attached with M3 screws. Note that the hole next to the reset button cannot actually be used because of the lack of clearance for the screw head.
Click this link to download the .stl file.
Arduino-Breadboard Holder with Standoffs.stl
CoMo Science 
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