Extruder Tension Setting Gauge

Edit/update: Thanks to everyone who has added it to additional groups/collections. I have reprinted it in blue so as to take a photograph with better contrast than the original red on orange.

While learning to print with flexible filament on my Prusa i3 Mk2s, I wanted to be able to quickly and repeatably set the spring tension on the extruder feed bearing. This gauge will probably be usable on many other models of printer with a similar tension mechanism. (springs on M3 screws).

Loose and