Applications of syringes for DIY builds are limited. There are some legitimate fluid handling applications. However, used, they're medical waste, and probably shouldn't even be touched.
But kids go crazy over heavy equipment, and this is a good option for a science experiment or just a cool toy. Videos indicate that syringe-operated hydraulic models seem to be trendy now as projects for mechanical engineering students.
This one is from what I believe is a YouTube channel run by a young man with projects like homemade cotton candy makers, slingshots, candy dispensers, etc.
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