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This sounds like a grand under taking! it'd be perfect to not have to build all kinds of different things, and just go ahead with some free hand design bits. The tricky thing, is that the plastic bits the pen puts out, aren't the strongest. You could definitely build up a zipper pull tab, but I'd likely reinforce it internally with some metal bits for strength. Then build the plastic around to avoid slivers. Metal slivers are the worst.

Can you get a different plastic for it? And to change the subject completely, have you heard of Sugru? It's like silly putty that sticks to things and air dries to silicone rubber.

I had not heard of sugru. Until now! OMG!! It looks amazing! I'm going to have to send those people some of my steem dollars! Wow! I could use some..of...that!! yeah!
And, I have only just seen the one type of plastic for these pens. It's basically just a little adjustable feeder, attached to an iron. But it runs really efficiently, compared to some of their older models. From what I learned about their reviews.

domestic ninja indeed!!

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