

It is a perfectly valid approach, and there are also many other perfectly valid approaches. “Better” requires a definition of what you want to be better. If there’s something that’s making you uncomfortable about the process, let us know what concern or issue you’re seeing with it and maybe we can guide you to a better way for you. But there’s nothing wrong with the way they’re doing it. Others may have different preferences (including you, YOU might have different preferences!) but they’re just preferences. It’s not right or wrong, even if some people argue that it is, they’re always going to have some preferences embedded in that judgement. There’s always more than one way to do it. That’s the joy of it, really, and sometimes you’ll have to experiment yourself to find out what ways YOU like the best, that make sense to you, that are comfortable for you, or that do things the way you want to do them.
It’s your own self-hosting setup, you get to make the choices. Sometimes the number of choices can be intimidating and lead to analysis paralysis but the only way out of that is to realize that there really is no way of finding the “best” until you’ve tried many different ways and figured out the “best” yourself. That’s why the only real advice I can give you is to just go through the tutorial you’ve found and do it the way they do it for now. You can change later, as you learn more, when not if you decide you want to do something differently. Because you will. We all do. It’s part of the process.




Your idea certainly has some interesting potential, but I think the biggest problem you might find is that it might clog up quickly or dull and lose its abrasiveness and thus be even more quickly disposable (and thus cost-inefficient) than sandpaper already is. That might not be a deal-breaker, if it enables some particular method that you can come up with, like what you mentioned with the chess piece, but I doubt it’s going to be useful as, or cheaper than, a direct replacement for sandpaper or sanding blocks on a larger scale. Yes, a continuous stream of fiber-infused filament is certainly great at sanding away at a nozzle, but that is mostly all fresh filament right off the roll, inch after inch and layer after layer of it, the nozzle is the piece that’s there continuously enduring the relentless abuse, but it rarely sees the same bit of plastic touch it more than a handful of times.
If you try to use the same bit of plastic that’s already sanded its way through a nozzle it may have lost some of its abrasiveness already, but even if it hasn’t I would still be concerned that it might lose its abrasiveness quickly under actual use as an abrasive, it might be difficult to clear out removed material, it might have a lot of friction and heat up, potentially even to the point of localized softening of the surface, allowing any fibers to be flattened or pushed back into the plastic and smoothing the surface. Lots of things are great abrasives in theory, but don’t have any practical use. Sandpapers and polishes are specifically selected to be as cheap and durable as they can be for the job they’re trying to do.
However it is certainly an interesting idea, and worth trying. I’m curious to find out how it performs. Let us know how it goes! Worst-case scenario, using a printed design to make obscure, form-fitting shapes for other abrasives to be applied to seems like an under-utilized application for 3d printing.