Radius gauge 1-20 mm M3 Improved, Pan Head Screws and Larger Hex Nuts

This only changes the “covers” from @IPIND3D 's model. Get the other pieces from here: https://www.printables.com/model/432769-radius-gauge-1-20-mm-m3-improved Thanks to @IPIND3D for doing the initial remix. Also, thanks to @mibla_44019 for making the original model, which can be found here: https://www.printables.com/model/137696-radius-gauge-1-20-mmhttps://www.printables.com/model/137696-radius-gauge-1-20-mm