The threads on steel bolts are designed for strength and to resist stripping. But they’re no match for a 150-ton hydraulic press. Place your bets now and guess how many kilograms of force different kinds of bolts can survive. While most of them compress, the biggest one explodes when it fails.
Robinson Foundry shows how he made a double-threaded bolt using the lost PLA method he used to make that awesome bronze skull. The process involves dipping 3D-printed models in ceramic, firing then, then melting away the plastic with metal. The design was inspired by a bi-directional bolt machined by Oleg Pevtsov.