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Low Budget CNC
Split Flap Display
Laser Cutting Class
How to make a solar filter for a telescope.
How to Build an Equatorial Mount for Long Exposure Astrophotography
Build a star tracker for your DSLR and make your own star charts!
Great Astrophotography - A How-To Guide
Build a Horizontal Sliding Camera Rig (Analog/Digital)
Valveless pulsejet engine(modified)