Flowrate Calibration Test
thingiverse
Testing multiple walls with a nominal diameter of 0.4 is just a quick calibration part. The source project can be found at https://cad.onshape.com/documents/855eea3408f444c870e9d20f/w/897c27c212f22106982b733e/e/bb0fcb84509047b199979047, and if you have an onshape account, you should be able to copy the workspace and adapt it with your nozzle size.
Download Model from thingiverse
With this file you will be able to print Flowrate Calibration Test with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Flowrate Calibration Test.