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In case 3D printing is used, even informal architecture model can be manufactured repeatedly with dimension accuracy. In this study, 3 architectural models with various design elements were manufactured by 5 types of well-used 3D printing processes and the manufacturing speed and cost were compared. The manufacturing speed was found that the MJF process in which powder is combined with agents and then hardened by infrared heat, was the fastest, and the FDM process in which the material is scanned with a mechanical linear motor was about 7 times slower than the MJF method. The SLA, FDM, and PJP processes require manufacturing cost in proportion to the number of manufactured models on a platform, whereas the SLS and MJF processes increase the cost when the number of manufactured parts on a platform is small. The total manufacturing cost of the FDM process, which has low material cost, was the lowest, and the SLS process was the highest for one model and the PJP process was the highest for multiple models on a platform. These results give architect the basic guideline to select the most effective 3D printing process when making architectural design models.