Designed to work both as a filament guide and a tool to calibrate your e steps. The intent is that it is a permanent fixture on your printer, and any time you want to check your e steps all you have to do is mark the appropriate place on the filament in reference to the scale.

IMPORTANT!! Account for shrinkage. This tool is designed in actual size, you will need to scale it up to correct for shrinkage of the type of filament you are using. PLA is around 2% so you would print it on a scale of 102%
I tried to put mounts in a lot of places to make it compatible with any printer.
Love to hear feedback

inventor file included if you want to remix it

yes it is an NWA reference

Update:
Redesigned the filament guides for more strength. Now Mk3

Creality

Ender 5

Doesn't Matter

No

.16

.15