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Trumpet-Playing Robot Finger Mechanism

Creation's quality: 5.0/5 (1 vote)
Evaluation of members on the printability, utility, level of detail, etc.

3D model description

Finger mechanism for a Trumpet-Playing Robot. Includes 3 fingers that fit on the trumpet's body and can press each of the trumpet keys.

See the mechanism in action:

Read how I designed it using OpenSCAD in the blog post:

Source code for models:

What to print?

You will need to print the following parts:
* 3 × fingertip
* 3 × servo-gear
* 3 × servo-trumpet-attachment
* 2 × servo-mount
* 1 × servo-mount-middle
* 1 × rack-right
* 1 × rack-left
* 1 × rack-middle

Or you can simply print everything at once using build-plate.stl.

Required Hardware

  • A trumpet
  • 3 Micro servos (I used TowerPro MG90S)
  • 6 M3x10 screws for mounting the servos
  • 6 M3x30 screws for mounting the mechanism to the trumpet
  • 3 M3x16 screws and 3 M3 nuts for attaching the fingertips to the fingers
  • 3D file format: STL
  • Publication date: 2018/12/17 at 15:05



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