A thing that bothers me about wizard schools in popular media – outside of the magic-grade-school stuff, anyway – is that they're typically depicted as being basically magic universities, but their actual curricula and pedagogical approaches look much more like those of a technical institution. Like, buddy, that's not a wizard university, that's a wizard trade school. You can't just slap university student culture on top of trade school pedagogy. It doesn't work like that – the one emerges from the other!
"Well ACTUALLY wizards are" wizards are made up. They can be analogous to whatever real-world class or vocation the author wants. Wizard-school-as-university and wizard-school-as-technical-institute are both perfectly fine; what I am grumping about is wizard-school media that doesn't seem to have a clear picture of how different sorts of educational institutions actually operate.
Okay but now I really want to know what a Wizard technician would look like. Would he wear magical overalls with all kinds of reagents and magic tools sticking out of his numerous pockets?
A guy like that walks into your tower with a toothpick in his mouth, takes one look at your summoning circle and goes
“I see yer problem. You used chalk B12 instead of S3. B12 is only for transmutation circles. Gimme a sec I think I have a piece somewhere here.”
He fixes your circle, test summons an imp and goes.
“There ya go. Fit as a fiddle.”
“It’s the chalk.”
“The chalk? I always use that chalk, it’s never been a problem.”
“Ah - yes. This stuff will work just fine for most circles, but, uh - here, take a look with my loupe. You see the off-color flecks? Can’t hardly see them with the naked eye, but those are impurities. Silicates, might even be some iron in here, to be honest. Usually won’t cause a problem, but - you said you hadn’t tried this particular summons before?”
“First time trying a 5th level, yeah.”
“Those silicates will make your scribing a little fuzzy when viewed from the astral plane. You see, for example, these three fine lines here? With this chalk, on the astral that looks like one thick line with fuzzy edges. They can’t tell exactly what you want, and they’re picky lil’ critters so they just won’t do anything in response.”
“Really? Oh. I always thought the expensive chalk was just fancy to be fancy.”
“Making pure chalk is difficult, you need a dedicated production line or dust gets in the finished product. To be honest, you don’t need to bother with it for most things, but 5th and up, 5th level and up, it actually is necessary. Anything with lines within about two millimeters of each other.”
“So I need to start over?”
“Unfortunately yes. You’ll have to erase all this, but with some good chalk it should work just fine. Next new moon your summons should go off without a hitch.”
“Dang. At least it’s not my sigils, I was worried it was my sigils.”
“Nah Your sigils look good. Even and balanced. You know what you’re doing, it’s just an equipment problem.”
“Thanks for the help, sorry to make you come all the way out here.”
“No problem! It’s my job.”