Good morning Fred,The ridges are impossible to measure as they must be in thousandthsHarkening back to your post #11How do I take your code in post #11 and use it for my printer (stl)?Does that code have the thickness of the axle it will insert onto is 1.9mmI'm so excited to get started, just don't know what to do with your codeThank you for your help and patienceJeff