Do you want to design real-world objects as a mechanical engineer would? In this tutorial, we'll overview the reasons for using a parametric modeler and best practices for doing so. You can use FreeCad to create parametric mechanically accurate parts and then import them into blender for assembly fit and 3D printed part creation. This methodology can be used to design your own 3D printer. All files for this tutorial are available in the open-source 3D printer design that can be found here.
Have Fun Designing!