This is a device used to filter smoke during welding, requiring a 12v 12cm * 2.5cm fan and activated carbon filter cotton (size used for the finished smoke filter: 130 * 130 * 10mm). It can also be used for gas filtration in printers. Note: The top cover may not close due to potential inaccuracies from printing, so you can skip printing it.

12v12cm风扇，加活性炭滤棉（成品烟雾过滤器使用的尺寸：130*130*10mm），也可用于打印机内的气体过滤。注意：顶盖可能会合不上，可以不用打出来