Among the alternatives are fused deposition modeling and so-called 3-D printers, which can crank out pieces quickly and inexpensively, although they may be a bit less accurate and long-lasting.

• 同类技术还包括熔融沉积成形以及3D印表机，3D列印技术可快速制作模型，成本不高，不过往往不够精确也不够耐用。