Im 3d printing a model for a 2 axis potentiometer, and I need a carbon ink mixture that will hold up to the copper wiper, and produce around 10kOhm resistance in a line around 1mm*6mm. Searching Google, I can only find ways to increase conductivity for some reason.

  • 2
    \$\begingroup\$ @HarrySvensson Nitinol? Muscle wire? Is that what you really mean? I suspect you mean nichrome? Since we're talking about resistance and you mentioned heating wire? \$\endgroup\$ – DKNguyen Aug 4 at 6:22
  • 1
    \$\begingroup\$ @buckithed Why don't you just 3D print a joystick into which potentiometers can be installed so that it rides on the pot's shaft? Those are load bearing parts that should run on bushings or bearings to be smooth so are not suitable for the contact surfaces provided by 3D printing anyways. Or hall effect sensors? I'd still add metal shafts and bushings or bearings somewhere in the design if you go with hall-effect sensors. Maybe you already have. \$\endgroup\$ – DKNguyen Aug 4 at 6:29
  • 2
    \$\begingroup\$ Commercial joysticks that use pots use conductive plastic pots. The good ones anyways. Trying to use conductive ink and copper brushes is a losing proposition on both fronts. One oxidizes and abrades while the other is vulnerable to abrasion. Other types of pots have a lifetime that is too low, or noise with wiper movement, or non-repeatability due to too much stiction. Where did you get the idea that joysticks use conductive ink? I have never seen one that does. \$\endgroup\$ – DKNguyen Aug 4 at 6:31
  • 1
    \$\begingroup\$ Also, trimmer pots, by definition are pots that aren't designed with particularly high endurance since they are designed for trimming (set-and-forget). You want actual potentiometers. Big old things with steel shafts sticking out of them. \$\endgroup\$ – DKNguyen Aug 4 at 6:36
  • 1
    \$\begingroup\$ If you want really small then pots are too big and trimmer pots probably don't provide enough attachment points. Consider with tiny tiny metal shafts and bushings and a tiny magnet at the end of the moving stick directly above a stationary magnetic position IC. Here is an example (look at the image): melexis.com/en/product/MLX90333/… \$\endgroup\$ – DKNguyen Aug 4 at 7:01

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.