This is the same design as my original klackers but 2.75 X's larger and redrawn with the same clearances. it is VERY LOUD! My wife really hates these things... 275% on a 50 degree angle was about the max size I could fit on my Prusa MK3.
Its printable with no supports. I used 5 outlines and 25% infill for the first 25mm, 6 outlines and 50% infill to 155mm, and 5 outlines and 75% infill for the rest. I broke two before I got to this point so I would not make it any weaker. If anything I would add more material to make it stronger.
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My cat kept rubbing on the tripod moving the camera... :-)