A large tolerance test if your printer or filament fused normal tolerance test, the sizes are .25, .5, .75 and 1 mm.
My printer and/or filament is terrible and the tolerance test i printed always fused together, and I design this large tolerance test. It printed around an hour and used around 3 meter of filament

If you are calibrating your printer and you have setup OctoPrint, I recommend you to use this plugin https://plugins.octoprint.org/plugins/CalibrationTools/ and https://teachingtechyt.github.io/ for people have/don't have OctoPrint
The author hasn't provided the model origin yet.