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Video instructions and demonstration:
The trickiest part in sewing face mask patterns such as the Deaconess and Pocket Mask is the pleats. This tool helps you fold them.
How to use:
Previous updates:
Update (May 12, 2020) the new fin design is working great, so I am deprecating the old version. I am also deprecating the widest version, since the extra width is unnecessary, takes longer to print, and just makes it harder to iron. The SLIM version is now STANDARD and the ULTRASLIM is now SLIM. All of the files now have the new fin design.
Update (May 11, 2020): I added an experimental Ultra Slim version (49 mm wide) with deeper-angled fins. I haven't had a chance to test it thoroughly, but most likely, this will be the best version. If you are printing lots of these, this is probably the one you want. If there's anyone who has the capacity to help test these, I would be much appreciative. If all works as planned, I will replace the other versions with the deeper-angled fins of this one.
Update (May 7, 2020): I made the standard version a little less wide and removed the "face up" and "face down" lettering. The measuring lines on the down side make it pretty easy to orient the pieces without the lettering, and it saved some printing time. I also changed the spacing between waves from 0.8mm to 1mm to allow for slightly-thicker double fabric. I also made a few other minor ease-of-use updates.
The STANDARD version is now 95mm wide (3.75 inches).
I also made an experimental SLIM version that should print much faster. That version is 75mm wide (2.95 inches).
Update (April 20, 2020): I completely overhauled this thing. It now prints in one piece without supports. (Well, two pieces since there are two jigs in a set.)
The "wave" shape of the new version leaves more space for two layers of fabric and just works better.
Recommended print settings, optimized for speed without sacrificing much strength:
Layer height: 0.2mm.
Wall thickness: 0.8mm.
Bottom thickness: 0.4mm
Top thickness: 0.6mm
No supports.
Infill density: 10%.
Infill pattern: Zigzag.
Infill overlap: 14%.
Horizontal expansion: For PLA, to keep the actual size accurate to the model, you might need a negative number in Cura's Horizontal Expansion setting. "-0.1" works for my printer. If you're having trouble getting two layers of fabric to fold in the jig, adjust your horizontal expansion on the next print.