Variation of: Adding Screw Threads to 3D Printed Parts

just got the “Adding Screw Threads to 3D Printed Parts” tutorial, and thought of an old problem of mine…

how would you go about creating a jar lid when you only have the jar…?

we have some very old butter churn jars, which have lid sizes over 8 inches, each with different thread pitch…

since the jars are clear glass, i’ve even tried painting them to get a good laser scan, but either i am doing every thing wrong, or using the wrong methods…

any advice…?

william…

Screw tops on glass jars are fairly standardised and there is a lot of stuff on the internet from container manufacturers that explain the screw threads. This one for instance

You’ll find a lot of drawings of container threads here as well. As for laser scanning your glass container: you can buy a special aerosol spray for reflective surfaces which should help, alternatively we used to use athletes foot powder spray!

Hope this helps.