3D printing has become one of the most promising methods to construct delicate 3D structures. However, precision and material utilization efficiency are limited. Here, we propose a one-droplet 3D printing strategy to fabricate controllable 3D structures from a single droplet ascribing to the receding property of the three-phase contact line (TCL) of the resin droplet. The well-controlled dewetting force of liquid resin on the cured structure results in the minimization of liquid residue and the high wet and net material utilization efficiency in forming a droplet into a 3D structure. Additionally, extra curing induced protruding or stepped sidewalls under high printing speed, which require high UV intensity, can be prevented. The critical is the free contact surface property of the droplet system with the introduction of the receding TCL, which increased the inner droplet liquid circulation and reduces the adhesion properties among the liquid resin, cured resin, and resin vat.

3D 打印已成为构建精细 3D 结构的最有前途的方法之一。然而，精度和材料利用效率是有限的。在这里，我们提出了一种单液滴 3D 打印策略，从单个液滴制造可控 3D 结构，这归因于树脂液滴的三相接触线 (TCL) 的后退特性。液体树脂对固化结构的良好控制的去湿力导致液体残留物的最小化以及将液滴形成为 3D 结构的高湿和净材料利用效率。此外，可以防止在高打印速度下额外固化引起的突出或阶梯状侧壁，这需要高 UV 强度。关键是随着 TCL 的引入，液滴系统的自由接触表面特性，