Figure 5.

Wax patterning approach that used 3D-printed masks to shield the paper from modification. (A) 3D-printed PLA parts (green and pink) and a strip of paper. (B) Assembly of the parts with the paper strip sandwiched between the green rectangular base and pink mask. (C) Resulting wax patterns on paper. (D) Microscopic image of a wax pattern defining a paper channel (approximately 2 mm wide), with a ruler for size calibration. (E) Correlation between the size of the 3D-printed masks and the actual channel size. Error bars show standard deviations (n = 5 per data point).