OK, good idea, will update the title as soon as I am ready with my first 3d printable tool... a lock ring remover, specifically designed for the white industries ENO lock ring... but might be usable for others.
One thing I am experiencing, which I actually expected is... While I can design a model attempting to match the original tool as much as possible, due to this being 3d printing, and the tools will be in plastic... compared to their metal counterparts... they usually don't have the strength necessary. This likely wont' be true with every tool, but definitely for most. BUT, the simple solution is to modify the design, so that it can still do what it was supposed to, just build differently than the original. It's also going to matter what plastic the tool is printed in, while PLA is the most common 3d printing filament, due to it's ease of printing... it's almost never gonna work for tools. ABS and PETG might work for some (and my goal is to make designs that at least can work as these when possible).... but for most tools, the best option for a 3d printable plastic is going to by PolyCarbonate (or something very close, ie. my preference, PC+PBT). Sadly all PC based filaments are on the harder side to print. I've had good luck by setting my bed to 130 degrees Celsius, and my nozzle to 245-255C. While many people can get their nozzle to this (assuming they have a full metal hotend), not so many can get their beds that high. This is why I'm gonna try my best to get these to work as ABS and/or PETG, which are both similar in strength and ease of printing (generally require heated beds, and ideally full metal hotends... but not in the crazy high temp levels like a 130C bed, more like a 50-90C bed is more than enough for those).
Anyway, my plan is to first design a model imitating the original tool as much as possible (when it is practical to start there)... Then start making adjustments until I feel it's functional as plastic.. then possibly make additional versions slightly different to give people some options. I'll try to release all the versions, as well as the Fusion360 model so people can make their own changes if they want (I try to set almost every dimension as a Parameter, so anything can easily be adjusted with no 3d modeling knowledge... just need to change some numbers in the list of Parameters, and watch as the model automatically updates itself).
To give an example of what I mean, I'll describe my current work on the White Industries Lockring tool. I basically made something almost identical to the metal tool, with similar dimensions, that could attach to a 3/8" socket wrench (I'm pretty sure that's what the original tool works with... though that's an educated guess based on the size of the lockring, and the size of the photos of the tool. But, when printing this tool (doing test prints in PETG before I got to PC+PBT), the 3 small "teeth" that would connect to the lockring to rotate it, are so thin they would snap off with practically no pressure on them. Given, Polycarbonate would def work better but at the original dimensions, even PC might not be strong enough. The very simple solution here is to expand the exterior diameter.... that way the tool would still fit over the lockring, but the teeth could be as thick as I find necessary in my tests, so the tool should still function fine, just will look a little different (And with my 3D model, it is almost trivial to increase or decrease the exterior diameter.... so people are free to adjust to their liking... and if enough people request an adjustment, I'll even do it for them). Now, as I mentioned, I made this to attach to a 3/8" socket wrench.. simply because that's what the original did. BUT, this could theoretically be a weak point (tho I admit, likely won't be an issue).. but what I might do as an alternative model/option is instead of making it attach to a socket wrench, simply make it shaped so a common wrench can be used to turn it (probably something like a 15mm wrench)... since it's a plastic tool, this other version would likely be a little stronger and hold up better than the first... even tho the 3/8" socket likely will work just fine.
Good news is.. I'm pretty much done with version 1 of this tool, just need to do a couple of final test prints. Then depending on how they go, may or may not make the second version I described right away. Hopefully I'll be able to release at least the first version by the end of today.