Summary

I'm working on some non canning designs which require that a screw lid which mates with a standard mason or ball jar. I printed a number of the existing thingiverse designs before deciding that I needed my own accurate base model for my subsequent designs. I'm putting this base model up because it's useful, as is, in it's own right.

NOTE: ADDED Original Solidworks 2014 design file as well as STEP and Parasolid.

Instructions

The glass part of a wide mouth Mason or Ball canning jar has a 0.25 inch pitch single turn thread with a base diameter of approx 2.63 inches. A minimum side wall thickess of about .060 was chosen to insure a robust abaility to torque it down. It could be thinner. Looking at the photos you'll see that there is a flat ring on the inside of the top. This matches the rim of the jar and provides an improved landing/seal zone for the lid.
This particular jar lid was designed from scratch in Solidworks 2013 then printed on an Ordbot Hadron Printer in ABS with a modified QU-BD stepstruder. It was printed using a 1.75 mm ABS filament with a layer thickness of .2 mm (200 microns) and an 85% fill factor with scaffolding support turned off.
ABS Printing was performed at 235C on clear Monokote film over a heated glass bed at 110C for the first layer and 100C for all subsequent layers. Aquanet Extra Super Hold was sprayed on the Monokote to insure stick down. I've had no ABS stick down issues since I began using the above technique.

Screw Jar Lid for Pint or Half Pint Wide Mouth Ball or Mason Jar