2026-02-21 (Sa) CombBinderPen COMPLETED

I bought a manual comb binder at a thrift store, and I have started binding graph notebooks to track my projects and sketches. A few days ago, I found a discarded G2 pen refill in my apartment's coworking space, and I thought it would be neat to build a pen handle that fits perfectly into the comb binder and holds a G2 refill. Normally, I would not spend time on a project like this because it does not have a general appeal. I thought it was worth a day to make something for myself, so I measured the pen refill's dimensions and the comb binder spine full of paper.

I created a model, shown in a cutaway view, that will hold the pen refill and slide into a comb binder's spine without snagging. I made a removable cap to hold the refill in place. The rounded top was an aesthetic choice, not a functional one.

Green cap and blue threaded tampon tube

The first couple of prints failed, and I think it was because I tweaked the settings for generating supports. I added a small ring to the bottom of the handle so I could print directly on the platen. The print was vertical, so it took over six hours to produce on my resin printer. I had to drill out the central cavity because it was so tight that it would dislodge the pen refill's caps. I shattered a bit of the body when I drilled it out, but it was structurally sound. The pen has been a handy go-to instrument when I need to make a quick note.

I love it, but it is the opposite of universal

GitHub repo for CombBinderPen.
First time here?

Completed projects from year 1
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2026-01-08