A tire depth measure tool. 

Easy to print. 

If you don't have an AMS, put a pause at height. The numbers start al layer 31.

V.2. Corrected the legend “mm.” to “cm.”. Thanks to @BroesWillems for locating the error.

Important: Once printed, you have to slightly blend the gauge to ensure the inner connections are broken. The easy way is, upside down,  put your fingers in opposite corners and press the inner part. Repeat with the other corners. You must heard a little “crek”. Repeat if necessary. Then pull the gauge to the “0” mark. Hope you help