Handy little gauges to have on hand when you need to measure an inside or outside radius of an object. For example, purely fictitious and not at all what happened, you want to create a phone case for your mobile phone out of TPU. It has curves everywhere but how do you know the radius to model. These 4 stones allow you to measure inside and outside radius on 1 - 8 mm. They are not labelled, but easy enough to discern by observation.

The 4 stones are 1 - 4 mm radius, 5 - 8 mm radius, 1 - 4 mm fillet and 5 - 8 mm fillet.

Provided as an SVG file the intent of these stones is to cut them out of 3mm acrylic plastic. (You will need to download the txt file and rename to svg)

An STL file is also provided for 3D printing though your mileage may vary for the 1mm radii.