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Bahtinov wins every time. I printed my original on a sheet of paper, glued it to a thicker bit of cardboard, then cut it out with a ruler and stanley knife--pretty low skill level required. I have now ordered a metal one. You just send the file to a laser cutting firm and pay the money.
The triangular hole hartmann is better than the round hole one, since you get to see good diffraction spikes in focus, but still not as good as the bahtinov.
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