When evaluating the surface finish of untested filaments, this test id for you. Especially when printing with matte materials, the flow (or in this case the speed) is defining the finish and how glossy/matte the surface will be.
This test has eight sections to test the finish:
The model is 30mm in height, with 3mm sections, so 10 different speeds can be tested (e.g. 20 to 200 mm/s).
The Thickness is chosen to be two extrusion widths (0,42-0,45mm).
The test takes roughly an hour (greatly depending on your settings).