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Has anybody tried to fabricate, with or without a 3d printer, any parts? especially Parker 51 vacumatic blind cap parts? esp on the Mark 1? I have a Blue 51 Mark 1 (vacumatic with the plastic plunger and all-plastic blind cap) that I think is a a demi because it was short, but the diameter is the same so i don't think it matters. I do not care if the color is the same (not like pink or a bad looking color though) or if it is even the same shape since it isn't a very intriguing or necessary shape anyways. The bottom lip has a chip that is about 90-120 degrees around the bottom but not deep, so it doesn't affect usability but is clearly visible by as breaking the continuity/seam and as a kinda "hole" in the side. I'm thinking it might be hard to 3d print usable threads, but I think the following things could be done. 1. Print something that vaguely resembles the cap and have an inset with the threads in another material like homemade casein (milk protein plastic), modeling clay, sugru (moldable silicone that stays set once cured), or a Thermoplastic like InstaMorph (plastic that can be reshaped as well as finished in several ways) 2. Have the whole thing one of the materials listed and hand shape it or even better make a mold of the current cap. 3. Have it 3d printed or one of the materials listed and fugure out a way to have it attached another way than threading. I haver some ideas but not really sure of the best way. I am thinking like some sort of small locking or snap mechanism or like locking friction threads. If anything I could have like a friction-fit end cap with "arms" that run down the pen a little, and if the whole thing or at least the "arms" are made of the silicone sugru it would almost definitely grip if it is what I imagine and double as a roll-stop as I don't usually post even when the pen is short. As long as it works, and doesn't cost much more than an actual blind cap or I can sell another to offset the cost I am probably going to make my own blind cap for at least the experience/fun/challenge/new techniques so if you are interested contact me.