Smoothed QMX / QCX / (tr)uSDX Knob
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This is a remix of Adam Kimmerly's (K6ARK) QMX/QCX/QDX/(tr)uSDX knob. Low profile, easy to spin.
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This is a remix of Adam Kimmerly's (K6ARK) QMX/QCX/QDX/(tr)uSDX knob. The original K6ARK knob is an excellent design, it is low profile, light weight and makes the tuning knob very easy to spin giving the QMX more of a full size desktop or mobile radio feel. If you have a QMX/QCX/QDX/(tr)uSDX do yourself a huge favor and print one of these knobs! Thanks for sharing your design Adam!
I made a couple minor tweaks to improve the original design. Compared to Adam's original knob I rounded the top surface of the ring so it doesn't feel like it's cutting into your finger when you spin it. I made it very slightly taller (0.5mm) to increase the material above the D-shaft. This is because when printing right side up that surface is too thin and distorts/sinks, enabling supports help but not enough to be distortion free. Lastly I increased the hole size for the set screw to fit M3 (I didn't have any set screws of the correct size handy).
It needs to be printed right side up. I used a Prusa Core One with variable layer height, smoothing, and ironing enabled. Galaxy Black PLA with 0.4mm nozzle, 15% infill.
Example photos show the original knob and the modified/rounded knob side by side.