Well, shame on me, but I honestly haven't seen any good YT tutorials, on any topic.
That doesn't prove they don't exist.
No, but asserting they do, without providing a single example, is just inane. If you want to be like that, please go preach in a church.
Do you know who Dave Jones is? Do you know he has YT tutorial videos.
EEVblog videos are tutorials? I always thought of them as off-the-cuff examinations/explanations/sessions, not as tutorials per se. (Note: I'm not being snarky or anything here, I'm being genuine here.)
Some of the videos David made did feel like attempts at tutorials for me, and they really were cringe-worthy.
With regards to 3D printing, the videos I've seen that are intended for beginners fall into two rough categories: uncritical adverts, and a mix of experience log, review, and tips-and-tricks. Haven't come across anything I'd classify as an acceptable tutorial.
Perhaps this is once again just a language issue? Me fail English often, after all; but so do even native speakers.
I am using the
wiktionary definition, i.e.
"a lesson prepared so that a student can learn at their own speed" or
"an interactive class taught by a tutor to students".
So does a physicist named Leonard Susskind, but I know it's all trash right?
Most of his videos I've seen are recorded lectures, and I've enjoyed a couple of his talks and discussions, too. I can't seem to find any tutorials he's made; could you point out one to me, so I can better understand what you are referring to?
Say - can you show us you 3D printer and some of the things you've printed and some of the mods you have done to it? I'd really like to see for myself. 
My Anet A8 is in pieces, as I'm working on enclosing it with a metal shell and plastic sheets (polycarbonate and PMMA), so I can add activated carbon filtering. I live in a studio apartment, and the fire alarm is too sensitive for me to use the printer without it; I can even trigger it by frying bacon in my kitchenette. Let me know if you really need images of the parts, and my OpenSCAD design for the enclosure (using 40x20mm steel or aluminium tubing, 1.5mm or 2mm wall thickness).
As to actual prints, I don't have any. I've worked on the software -- in particular, implementing true 3D cubic Bézier curve paths, with separate velocity control; the math of which is iterative but efficient (so not feasible on AVRs, but very feasible on ARMs for example) -- and lots more on 2D vinyl cutters driven using HPGL and Gcode. As is typical for me, I am much more interested in the tool itself, than in what others use the tool for. I can show you the first-generation Smoothieboard I have, to give you an idea of how long I've played with the software side.
However, I fail to understand how my complete inexperience in producing 3D prints (or even 2D vinyl decals!) is relevant to my opinion and experience in tutorials.
Have you ever taught a class at an university? I have, I was a paid lecturer the first time over twenty years ago, myself in my twenties. It was a department of Art Education too, with an emphasis on education, and while I don't have much formal education in education (pedagogy), I've worked with quite a few experienced professionals and discussed various ways of making the materials more available and efficient for the learners -- not just then, but regularly at my current university (my own field is computational materials physics). Admittedly, my focus has always been adults and not children; wrt. children, I've only discussed and developed materials for teachers to use when teaching children, never worked on materials intended directly for children to use.
Perhaps that is the cause of the failure here; I just cannot reach the segment of the audience you belong to, xrunner?
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