Pentel BK77 cap
thingiverse
Alternative caps for my favourite inexpensive pens: Pentel BK77. I lose caps too often and I don't want a partially used pen to dry out. Hence these caps I've designed after measuring originals and some trial-and error. 12d0 (outermost diameter, at bottom lip: 12.0mm) version is a tight-fit one, requiring a bit of force to both put on and take off. Makes them harder to lose accidentally! 12d5 (outermost diameter, at bottom lip: 12.5mm) version is a loose-fit, it clicks but is easy to remove just like the originals. This is a quick hack, clicked in Tinkercad after measuring original cap (and some trial-and-error), so it has some visible artifacts of boolean operations. I'll clean it up later. It still prints smoothly.
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