Builds / Lars Zimmermann / O.pen / Other · February 13, 2024

O.Pen – pen

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“O.Pen” is a simple but effective open design ballpoint pen with a special feature: Conventional pens are usually designed for one type of refill. O.Pen connects to all available refills! A design by Lars Zimmermann.

Globally available:

Locally ⚑ available in:

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On parts & builds

  • “It happened to most of us: Our favourite ball point pen is suddenly out of ink. We search for another ball point pen to swap the refill. Only to discover: the refills are different. The new one does not fit. Well if the O.pen is your favourite pen this won’t happen again.” The pen fits to all available refills:

  • ↑ This pen can hold different kinds of refills. The inner tube has an insert thread to lock the refill in place with a set screw.
  • The images show different prototypes testing the same idea. It works. ↑
  • Need a cap? A short piece of silicone tube will do. (See image with the black caps) 

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