The file 'Extrusion Calibration 3D Printer Model' is (STL) file type, size is 5.5KB.
I use this to test for over/under extrusion on new filament. Can be printed at 100% infill, checking for complete infill and varying extrusion rate as it prints; or at a low infill, and checking for a smooth top layer. Dimensions can be also be checked.
Extrusion_Test2.STL | 25.5KB |