Fillet diameter radius gauge | Key worm

What it is

A gauge to determine inner and outer radii/diameter, ranging from 1 to 15 mm in 1 mm increments.

For some reason victornpb's model triggered me to design a gauge that does inner and outer fillets/radii in one piece. I wanted to contain the wavy look and a small size, so it would still fit in a case for calipers. While i was on it, i got carried away. It looked a bit like a worm to me (maybe), so it got an eye for cuteness and as a result is now carriable on a keyring.

How to print

There are three versions awaiting you:

1. with depressed digits
   • 0.4 mm nozzle or smaller is recommended
2. with raised digits
   • 0.4 mm nozzle (or smaller) is recommended since it matches the stroke width
   • 0.6 mm nozzle is possible, as can be seen in the pictures above
3. with raised digits and ring gauges
   • 0.4 mm nozzle or smaller is recommended
   • hole clearance designed is 0.1 mm

The digits and lines are designed with a stroke width of 0.4 mm. Recommended for printing is a 0.4 mm nozzle and 0.2 mm layer hight (at least for the last layer). A multicolor version is just a matter of filament changes between layers. → In case the digits won't print neatly after said filament change: A draft shield, wipe tower or any object to consume filament beforehand (establishing good flow by doing so) may help. All versions are available with raised/depressed digits by 0.2mm and additionally 0.4mm.

Material at one's discretion, I used PETG which is robust and has a nice flex to it.

What next

There may be improvements and modifications based on feedback given here.

Maybe, take a look at my other designs ;-)

Mentions

Credits to Archimedes of Syracuse, who absolutely died for circles and Carl Friedrich Gauß.