Gear and box
1.MakerCase
https://zh.makercase.com/

2.GearDXF
http://www.forestmoon.com/Software/GearDXF/

3.Involute Spur Gear Builder v2.0
http://hessmer.org/gears/InvoluteSpurGearBuilder.html


1.MakerCase
https://zh.makercase.com/
2.GearDXF
http://www.forestmoon.com/Software/GearDXF/
3.Involute Spur Gear Builder v2.0
http://hessmer.org/gears/InvoluteSpurGearBuilder.html