3D printing of capacitive interface device.

<p><i>a)</i> the CAD design of the printed interface device and the simple circuit used to detect inputs, <i>b)</i> a photograph of the printed device, <i>c)</i> a macro image of the printed sensor pads (scale bar 5 mm), <i>d)</i> the capacitance of each printed sensor pad plotted against time <i>e)</i> an enlarged portion of the graph from part d showing the cross-sensitivity of each sensor pad.