Humanoid Robot Elbow Joint

Create ONLY the mechanical elbow joint that connects a humanoid robot's upper arm to its lower arm. Do NOT create or include the upper arm, lower arm, hand, fingers, servo, motor, screws, bolts, nuts, bearings, wires, or any other parts. The output must be a single compact elbow-joint mechanism with: * One central pivot axis * Forward/backward bending like a human elbow * Strong circular pivot housing * Two mounting interfaces on opposite sides for attaching the upper arm and lower arm * 12 mm central pivot hole * 4–5 mm thick load-bearing walls * Reinforced pivot area * Integrated mechanical rotation stops * Rounded edges and filleted corners * Lightweight but strong geometry * Suitable for FDM 3D printing The joint itself should be approximately 80–90 mm wide and compact enough for a humanoid robot. IMPORTANT: Model ONLY the elbow connector/joint. The upper arm and lower arm are NOT part of the model. Do not add a servo or any hardware. Create a clean, realistic mechanical humanoid elbow joint, not a complete arm assembly.

Parameters

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.