Test object for 3D printers allow 4 different condensed checks and optimizations:

1. clean, flat horizontal, 45° and vertical surfaces
2. stringing / retraction settings
3. different changes and dimensions of gaps
4. affects of gaps and stringing / retraction at different layers The print allows by the effects of less material input, quick response and an easy multitest of the printer capabilities an effective optimization of the printer by comparison of efficient parameters to get perfect surfaces.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/lWqHIiBkdcH