From YouTube user ammnra:My version of the Assassin's Creed Hidden Blade
I designed it in SolidWorks and made the parts with an Eden 350 printer
Based on a dual action Out The Front (OTF) Mechanism with a ring driven ratcheting pulley system to index the OTF Mech.
Blade locks in both the extended and retracted positions and can be extended and retracted regardless of arm orientation (no gravity/arm shake required).
Still waiting for Ubiworkshop to make the Desmond hoodie (black version) and then I'll have a complete modern "Myles" assassin costume.