An Arduino Uno, Rev 3 in solidworks
Supplied as an assembly and a part for convenience
Dimensions taken directly from product data sheets and the EAGLE files for the Uno Reference design from the website, so the model really ought to be accurate.
Otherwise and as always with my models, it's probably useful to suppress the extraneous detail if it's not needed.
Software: SOLIDWORKS, STEP / IGES, Rendering, Parasolid, SOLIDWORKS