# Key Points from DIY Spectroscopy and Microfabrication Discussions

• DIY Raman spectroscopy projects were compared, with Ben Krasnow's calibrated version (documented at benkrasnow.blogspot.com) highlighted as a superior implementation compared to a Hackaday project.

• Participants debated LCD versus DLP projector technologies for DIY photolithography, with evidence that LCD projectors can achieve 2.5-5 micron/pixel resolution for fabricating micropatterns and microchannels when paired with appropriate objective lenses.

• A technical solution was proposed for overcoming LCD interpixel dead zones by implementing sub-pixel resolution motion, though this would require precise nanoscale positioning equipment.

• Researchers discussed building a custom microscope with nanometer precision using components like the KY1250C-L motorized stage (50nm step resolution) and incorporating microstepping geared stepper motors with backlash compensation techniques.

• An innovative microscope design was proposed using a binocular/trinocular setup with video in one ocular and laser in another, plus a Blu-ray laser positioned adjacent to the objective for multiple read/write capabilities.

• Several microfluidic technologies were discussed, including electroosmotic pumps for soft actuators, microfluidic pump arrays as alternatives to external syringe pumps, and particle sorting using surface relief structures.

• Kodak's microfilm technology was identified as a potential photomask material offering approximately 800 lines per mm (1 micron resolution) for microfabrication applications.