EDC Mini-ballpoint pen
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Tiny but usable ballpoint pen based on a Uni Jetstream refill for multi-ballpoint pen.
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Model information
- Source
- Printables
- Category
- Organizers
- License
- Creative Commons — Attribution — Noncommercial
I wanted a tiny pen to go with my pocket notebook, but couldn't find anything that was properly small yet usable, and that was based on great pen technology. So I got a Uni Jetstream refill for one of those pens where you can select different nibs, and designed a barrel & lid around this. As an afterthought, I added a pocket clip, which is a friction fitting to the lid.
Capped, it's just 7.4cm (less than 3") long, and with the lid posted for writing, it's 10.4cm (about 4"). It's a small pen, but definitely usable at that size.
All the parts are small, so you'll want to print them at high resolution. I used the 0.08mm high quality setting on my Bambu P1S, and increased the wall count from the default 2 to 3. This effectively prints all parts solid, without any infill voids:
Barrel and lid were both printed in PETG. I added a brim for both these, and enabled support, with "remove small overhangs" turned to OFF. The brim stops the barrel from lifting at the end, and holds the lid steady as it prints vertically.
There's a small ring just inside the nib end of the barrel, where I painted fuzzy skin texture to take up the printing tolerance and ensure the Uni refill is held snug.
The pocket clip was printed from PLA - the geometry of this part didn't want to play nicely with PETG, but you might have better luck than me. For strength, it prints at a 45º angle, so there's a support tower built into the model, which you snap off after printing. Again, it'll need a brim, as there's not much to hold down the first layer.
I added a feature to the face of the pocket clip where the support tower joins on that'll allow you to paint this with fuzzy skin too. This helps hide where the support tower has been snapped away.
At the top end of the barrel is a modelled mechanism to hold the end of the ballpoint refill. When this eventually runs out, you'll want to change it, and at the end of the barrel there's a 1mm hole that'll line up with the refill's case - just the right size to use the end of a paperclip to push it out.