3D-printed high torque strain wave gearbox - harmonic drive

Big thank you to PCBWay for sponsoring this project. Due a price drop in raw materials, PCBWay can now provide PCB’s at a reduced price. Use my referral link to get a 5$ discount when you sing up as a new user: I was fascinated by this type of gearbox and always wanted to make one. This type of gearbox is one of the most used in industrial robots. This type of gearbox only has a single reduction (in this case 2 because of the belt reduction) with a very high reduction ratio. Because of the single stage reduction there’s almost no tolerance/play between input and output shaft. Conventional gearboxes use more gears to achieve the same reduction ratio, the tolerances between the gears add up resulting in greater tolerances/play between the input and output shaft. Here are some specifications of the gearbox: Max tested torque at 12V: *cm or 4N*m Total reduction ratio = 54:1 Disclaimer: I do not own the Dodge Charger shown in the video, i was just fortunate enough to borrow it for a limited time 😅. (I really wished I owned one though). --- STL and Fusion 360 source files can be found here: More info can be found here: Tools and materials I’m using can be found here: --- Timestamps: 00:00 Intro 00:11 Mechanical design 00:39 Part fitment test 01:05 Prototype V1 01:50 First test run 02:18 Gearbox part manufacturing 02:33 Assembly 03:18 Second test run 03:39 Plexiglass lid assembly 04:21 Third test run 04:43 Speed controller design 05:10 Speed controller assembly 05:49 Torque tests 06:51 Final test: Dodge Charger! 08:35 Outro --- Music credit: Outro song: Sustainable Dignity by Catalyst Belgium Link to the video: Link to their channel: Their website: For use and licensing of this song, please contact Catalyst Belgium. Song: Joakim Karud - Classic (Vlog No Copyright Music) Music provided by Vlog No Copyright Music. Video Link: