A simple, clip-on E-steps measurement aid for extruder calibration!
Just clip it on to the filament (1.75mm), snug it up to the extruder, and mark your filament with a felt pen or marker. Remove it, run your extruder test, and clip back on to measure the remaining filament without needing to use calipers.
We recommend following the tutorial here: https://mattshub.com/2017/04/19/extruder-calibration/
You may need to adjust your nozzle size or line width in order to get the numbers printing correctly. Verify in your gcode preview before printing!
Simplify3D users may need to enable "Single Wall Extrusion" for inner and outer walls to print the fine details.
If the filament doesn't easily clip in, DO NOT resize the model, as it will no longer be accurate. Adjust your line width or flow multiplier and try again.