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Twistback Pen
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a pen that takes a pentel energel refill and spring
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Updated at source:
Model information
- Source
- Printables
- Category
- Office
- License
- Creative Commons — Attribution
A pen that has a twistback mechanism. It uses a Pentel Energel refill, and I used the spring from the same pen. More compact and pocketable, its able to lock with the tip stowed, and retracts with a slight twist when deployed. Printed at .2mm layer height with a brim. I would recommend applying a small amount of grease to the threads before assembly.