Mecha Sonic and Master Emerald - 3D model by HaughtyGrayAlien

Mecha Sonic MK. 1 (Sonic 2) - 3D model by Spex130 (@spex130) [1431dad]

Master Emerald - 3D model by swordmanck (@Swordmanck) [91b286c]

ArtStation - Mecha Sonic (Sonic 3 and Knuckles)

ArtStation - Mecha Sonic (Sonic 3 and Knuckles)

OC) (BLENDER 2.91) Sonic 3 & Knuckles Mecha Sonic Model (WIP, Currently needs texturing done) : r/SonicTheHedgehog

Genisis 3D models - Sketchfab

16bit 3D models - Sketchfab

master emerald 3d model by artsonx on DeviantArt

ArtStation - Mecha Sonic (Sonic 3 and Knuckles)

master emerald 3D Models to Print - yeggi