Brain magnet

This is a remix of @Pandart3Dhttps://makerworld.com/zh/models/75688#profileId-81096I added space for the magnetMagnet size is 6*2 mm round magnet修改檔案來源 @Pandart3D我新增了磁鐵的空間磁鐵尺寸是6*2 mm的圓形磁鐵