I’ve been making Gundam models for years, and the coloring stands keep disappearing or getting damaged, so I printed one myself. The model is pretty simple, with closely spaced holes, each 3.5mm in diameter.

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A new circular version of the spraying base has been added, with a curved top surface to reduce the chance of parts colliding while they dry after spraying. The link is below:

https://makerworld.com.cn/zh/models/1452753-mo-xing-pen-tu-shang-se-jia-di-zuo-v2#profileId-1580344