Rollerball Pen Refill Case
thingiverse
My daily carry rollerball pen's cartridge needs replacement soon and I don't want the refill loose in my bag for fear of damaging or exploding it inside my bag. It should fit any 6.3mm diameter (0.25 inch) refill with a length of about 112mm (4.4 inches), including the Pilot G2 refill. Friction holds the cap in place but if not, there's a small spring provision at the bottom to keep it shut. The cap was printed without supports, open end facing up while the body was printed with the opening against the bed for support of the locking lugs.
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