My modular soft-jaw project has been going through some fairly extensive testing this week at the shop. While I had intended for it to only be used in light clamping tasks where a part just needs to be located, my co-workers have attempted to use "Rev B" for other tasks such as power tapping parts. There was some cracking and crunching sounds but ultimately they survived and continue to work well.

Rev C addresses several areas where improvement was needed;

Soft-jaw flex (a result of having to design in lots of wiggle room since my Printrbot doesn't print part ID's very accurately) has been significantly reduced (or possibly eliminated) through adding an interlocking dovetail and tightening tolerances (which the Lulzbot has no problem with)

Eliminating soft-jaw delamination which occurred as a result of excessive flex and too thin of a shell/too little infill. The soft-jaw and insert now has a 2mm shell all around and 80% infill to allow some 'give' but make everything more robust.

Increase longevity of insert through increasing shell/infill as well as designing inserts for various part diameters. Currently I have one "v" groove insert, as well as round inserts ranging from .75" to 1.25". Print time for each insert is approximately 1 hour so creating more inserts to suit different needs is not a problem.