Figure 4.

Integration of high-resolution PMMA structures inside a FDM-printed channel structure. (a) Principle of integration of high-resolution microstructures inside the FDM printed channel. The microstructure is fabricated by polymerizing a PMMA prepolymer directly on a commercial PMMA substrate using a lines-and-space structure. The PMMA substrate is then aligned and fixed within the FDM printer and the microfluidic channel is printed around the microstructure. (b) Polymerized PMMA microstructure fabricated using photocurable PMMA prepolymers (scale bar: 100 µm). (c) FDM printed PMMA chip including the microstructure from (b) (scale bar: 10 mm). The inset shows the integrated microstructure (scale bar: 100 µm).