Thingiverse
Customizable Knob for CPAP
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This is a customizable knob to fit a D-shaft (shaft with flat) for a control that rotates and has push-on, push-off.
The housing it fits into has flats and ridges that interfere with pushing, and with the diameter of the print that holds the metal shaft.
I measured with digital calipers and wrote the openSCAD to model the broken knob, but better - stronger.
After an initial print that didn't fit, I added an option to the customizer to just print a test shaft so I could iterate on getting the dimensions right.
For the final print, I told the slicer to use concentric circles for the bottom layer - that's what you see in the finished print, in place on the CPAP.
In the slicer, I used a modifier to make the inner shaft use 4 vertical shells. That made it print solid, for extra strength.
The housing it fits into has flats and ridges that interfere with pushing, and with the diameter of the print that holds the metal shaft.
I measured with digital calipers and wrote the openSCAD to model the broken knob, but better - stronger.
After an initial print that didn't fit, I added an option to the customizer to just print a test shaft so I could iterate on getting the dimensions right.
For the final print, I told the slicer to use concentric circles for the bottom layer - that's what you see in the finished print, in place on the CPAP.
In the slicer, I used a modifier to make the inner shaft use 4 vertical shells. That made it print solid, for extra strength.
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