Fast edge over/under extrusion test

thingiverse

I designed a simple test piece to verify over or under extrusion on my 3D printer without wasting material or time. It requires only one gram of filament and takes seven minutes to print. This test piece helps determine if your printer is experiencing over or under extrusion by measuring the difference between the outer and inner dimensions. To use this test, print it with a 0% infill and a shell thickness of 1.2mm (three shells) using a 0.4mm nozzle. Allow the print to cool before removing it from the build plate. The test piece is designed to evaluate edge extrusion, with rounded corners that avoid corner over-extrusion and a slightly tapered bottom to prevent measurement issues due to the first layer. To measure the test piece using calipers, print one and measure the inner and outer dimensions. If the outer dimension is larger than the inner dimension, it indicates over-extrusion. Conversely, if the inner dimension is larger, it signifies under-extrusion. Alternatively, you can use a no-tool method by printing two test pieces. They should fit together perfectly and remain connected, indicating proper extrusion. If they do not fit together or have space between them, it suggests over- or under-extrusion. Update: A calculator has been created to calculate the flow value needed to compensate for over- or under-extrusion based on actual measurements of this test piece printed on your printer. Another Update: Check out my other calibration piece at https://www.thingiverse.com/thing:2753088