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Tips for connecting a servo motor to a 3D printed part?

Discussion in '3D Printing' started by samlevy0515, Nov 26, 2025 at 04:17.

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  1. samlevy0515

    samlevy0515 New Member

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    My Motion Simulator:
    AC motor
    Looking for suggestions on how to best attach a servo motor to a 3D printed part.

    I am building a fully 3D printed quadrupled 'robot dog' (see here if you're curious) and the shoulder joints (joints with largest torque arm) keep stripping whenever the legs bump into something.

    This is what the robot looks like, the joint in question (shoulder joint) is the one marked by the arrows, although I use the exact same attachment technique and geometry across all 12 servo joints (hips and knees).

    Some more pics here that show how the part and the servo attach. The servo is a JX Ecoboost CLS6336HV from Aliexpress, and claims 26.7kg.cm / 370.47oz/in stall torque.

    Here is what the servo mating surface looks like (you can see the pinion markings on the plastic). It's a pretty tight fit (hard to make it go all the way in with your hands, you need to torque down the screw to make it go in place).

    I don't think I can make it any tighter. The screw is also pretty tight (can't tight it more to add any more friction). I currently have an experiment printing right now with higher infill but other than that, don't have any more ideas.

    Anyone has any ideas for how to improve this joint?
    samlevy0515, Nov 26, 2025 at 04:17
    #1