). Failing to achieve a conformal and close contact between the modulating Κ 𝑜𝑏𝑗 ≠0 device and the object inevitably creates a considerable thermal contact resistance (e.g., air gap), significantly reducing thermoregulation performance. To resolve this challenge, we develop a solution-processed electrochromic device that can be directly fabricated onto the 3D curved object surface, allowing it to conform perfectly to the curvature of the base object and eliminate the air gaps. These limitations highlight the need for innovative fabrication processes to conformally render 3D surfaces with tunable electrochromic properties for effective mid-IR thermoregulation.