Summary

This is a fully functional hydraulic arm powered by water-filled syringes—no electronics or motors required. Designed for laser cutting, the arm mimics human movement with five degrees of freedom: base rotation, three arm segments, and a gripping claw. Each joint is controlled by a syringe, demonstrating core principles of fluid mechanics and mechanical motion.

Great for STEM education, science fairs, or just as a fun engineering project. Easy to assemble with standard hardware and clear tubing. All parts are optimized for 3mm plywood or acrylic.

This design does make use of some components not available for download:

• 17x 3mm diameter bolts
• 17x 3mm ID nuts
• 48x 3mm ID washers
• Karlling 10ml Syringe Without Needle (https://www.amazon.com/gp/product/B08JZ4KVQR/ref=ox_sc_?th=1)
• Eastrans 3/16" ID Silicone Tubing (https://www.amazon.com/gp/product/B0CQCLZ61K/ref=ox_sc_?th=1)
• Wood glue
• 2x Springs

Claw is not included in this file, but can be found in my profile here: https://www.thingiverse.com/thing:7031075