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Underwood "S" typewriter rubber foot — image 1
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Underwood "S" typewriter rubber foot

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This is a replacement rubber foot for an Underwood "S" typewriter.

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This is a replacement rubber foot for an Underwood "S" typewriter from the 1940s.

Print settings:

  • I used Siraya Tech Flex TPU - 85A Filament

  • Shore 95A TPU is too hard.

  • Softer TPU should work as well, but I haven't tried.

  • 85A gives decent grip on a smooth surface.

  • I fed the TPU directly to the extruder, no PTFE tubing.

This design is based on the original feet of my Underwood "S". The feet have a metal cup on top, some felt-like material below it, and the rubber proper. A screw holds everything together. The rubber has a slightly cupped shape to receive the felt insert, and appears a little rounded on the sides. I tried to replicate that, knowing that it is not an exact science and that the feet have changed shape a little and hardened over time. Some of the original feet of my machine were broken, and the rubber was rock-hard.

I made the center of the part taller compared with the original part, but it fits just fine.

The orange parts on the pictures are made of PLA for prototyping.

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