Exercise 1

Epifluidic fabrication in the lab:

• Creation of a 3D model for your design:

  • Design rules: Size must fit the adhesive,  design must be submitted to the teaching team in editable format, preferred fusion 360.

  • preparation of your 3D printed mold: Rinse sufficiently in IPA, Bake at 70 C for 24 H, apply silicon demolding spray before casting

  • cast elastomer on mold and cure in vacuum oven

  • cut on lasercutter to define outline and inlet and outlet hole

  • prepare cover sheet by casting elastomer on a glass slide coated with demolding spray

  • apply food coloring to the inlet reservoir and dry in oven @ 50C for 3 H

  • Under supervision use the plasma treater to initiate molecular bond

  • Bond cover and the imprinted design

  • define skin adhesive on laser cutter

  • apply device to skin and start sweat test

Tips for a successful design:

• resolution of our SLA printer is 10 µ m in Z and  is material limited in X and Y (https://www.prusa3d.com/original-prusa-sl1/). 

• For best results keep channel depth above 30 µm and channel width bigger than 300 µm (0.3 mm) and not wider than 1 mm

• Long channels will make it easier for you to follow the fluid progression

• There needs to be a boarder around your design that is higher than the channel depth to contain the elastomeric material 1-3 mm depth is recommended 

• Thickness of the substrate should be 2-4 mm