Some parts printed with Prusa I3 & Design Spark Mechanical

Here we can see some parts that I printed with Prusa I3 DIY 3D printer .
All these have been designed with Design Spark Mechiancal, a free 3D CAD, based on Space Claim CAD.

At the beginning I have some issues on have a perfect circle, but, the first failure was due to the low resolution on STL files.

The second image is  not a perfect circle, I will publish the second version that is better and we can see the differences