Flow Calibration Cube

The design files and instructions have been moved here:

Flow Calibration Cube

Update May 11, 2021

I've added flow calibration cubes for the following nozzle sizes: 0.20 mm, 0.25 mm, 0.30 mm, 0.40 mm, 0.50 mm, 0.60 mm, 0.80 mm, 1.00 mm. See How-To below.

About

One of the most important things for good quality prints is to get the flowrate / extrusion multiplier correct for your filament. Good news is that's it's easy to dial in.

How-To, 0.40 mm nozzle

For example, using a 0.40 mm nozzle, set the line width to exactly 0.40 mm in your slicer and print this calibration cube which has 0.80 mm walls. After you have printed it, measure the thickness of all four walls with a caliper and take a note of the widths. For example, let's say these are the widths of the walls measured:

0.81, 0.82, 0.83, 0.83

Then the formula to calculate the flow rate is:

0.80 / ((0.81 + 0.82 + 0.83 + 0.83) / 4) ≈ 0.97

So, the flowrate or extrusion multiplier is about 97% or 0.97 whic