Millirobots that can adapt to unstructured environments, operate in confined spaces, and interact with a diverse range of objects would be desirable for exploration and biomedical applications. The continued development of millirobots, however, requires simple and scalable fabrication techniques. Here, we propose a minimalist approach to construct millirobots by coating inanimate objects with a composited agglutinate magnetic spray. Our approach enables a variety of one-dimensional (1D), 2D, or 3D objects to be covered with a thin magnetically drivable film (~100 to 250 micrometers in thickness). The film is thin enough to preserve the original size, morphology, and structure of the objects while providing actuation of up to hundreds of times its own weight. Under the actuation of a magnetic field, our millirobots are able to demonstrate a range of locomotive abilities: crawling, walking, and rolling. Moreover, we can reprogram and disintegrate the magnetic film on our millirobots on demand. We leverage these abilities to demonstrate biomedical applications, including catheter navigation and drug delivery.

对于探索和生物医学应用而言，能够适应非结构​​化环境，在密闭空间中运行并与各种物体交互的Millirobots是理想的。但是，millirobots的不断发展需要简单且可扩展的制造技术。在这里，我们提出了一种极简主义的方法，即通过使用复合的凝集磁性喷雾涂覆无生命的物体来构造毫微微机器人。我们的方法使各种一维（1D），2D或3D对象都可以覆盖一层薄薄的磁驱动膜（厚度约100至250微米）。薄膜足够薄，可以保留物体的原始尺寸，形态和结构，同时提供高达自身重量数百倍的驱动力。在磁场的作用下，我们的millirobots能够演示各种机车功能：爬行，行走和滚动。此外，我们可以根据需要在Millirobots上对磁性薄膜进行重新编程和分解。我们利用这些功能来演示生物医学应用，包括导管导航和药物输送。