I finally decided to buy a inexpensive 3D-Printer from China. Within this section I am sharing the experience which I am gathering during my 3D designs and prints.
My printing gear
I started to 3D print on a Geeetech A30 (check the Geeetech Homepage):

Hadware & Software for 3D-Printing
In order to design, slice and print I am using following software tools:
3D Design Programs
- FreeCAD (to download check here)
- Autodesk Fusion 360 (Working with a start-up license which can be found here)
Slicers
I am using following tools to slice the 3D models into G-Code instructions for the 3D printer:
Print Server
In addition to the design and slicing part I started to use OctoPrint as print server.
This enables me to directly print sliced 3D-models via my network. >
OctoPrint is installed on a Raspberry Pi Model 3B+.