For me it’s the break in period on new strings. Always end up building a bit of a string burn, especially on the rougher ones (looking at you Mowl Fat 
).
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ehem* same happened to my KS whip until it got thin out after long hours of play, but the coarse feel is still there smh
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I got an upshift. Really liking the yoyo, suddenly notice the centre of the cup seems a bit scratchy or something no problem tried to clean it.
Come to notice its got these concentric machine lines or finishing lines. Hate that. How does this even happen. Ive had plenty of yoyos with flat cups and none of them have had these.
Truly ruins the yoyo for me coz now I am fixated on these and how scratchy they feel.
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I have seen these relatively prominent machining lines.
My guess is that it has to do with variability in the programming/tooling and whether the result is overridden by blasting, tumbling etc. (edit: or polishing)
I actually like the tactile aspect, so they could be intentional.
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same. it reminds me of a record except i can scratch this fidgity like without ruining music 
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Hearing people willingly slam titanium yoyos down on smooth ground to hear it ring. I get sparking on ragged surfaces, but something about this really peeves me off
I want to set fire to this yoyo😅. Im wondering if its only on the polished version or also the blasted one.
Machining marks like this are as a result of the machinist picking specific speeds and feeds for the machine manufacturing the part. These will always be present in some capacity on a machined metal yoyo but they can be largely reduced, however doing so will probably result in a slightly longer machining time, which in turn may result in a more expensive yo-yo, so it’s kind of a trade-off.
When I was operating the Petri at the machine shop I worked at right before COVID dropped, the guy operating the lathe next to me (who had been there for decades, was very knowledgeable in machining and CNC programming, and also had quite a bit of seniority at the shop especially in comparison to me) walked up to my machine while a part was running, went into the G-code for the part and modified the speeds and feeds at a certain step. When I asked him why, he told me that he thought the sound of the tool cutting at the specific part he edited was too loud, and it was annoying him. He changed it so that the tool would be quieter and wouldn’t bother him as much. I didn’t really know how to respond, so I just got back to work. Anyways, I say this because if there’s anyone out there who owns or has observed multiple Petris and has noticed that the machining marks differ between the two, it’s because of my former coworker’s relatively low threshold for irritability.
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Just was yoyoing and had a thought of another pet peeve…when you go to do a whip to kamikaze and it just slaps off the yoyo like dink. Makes me feel like such a weak man. 
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People who heap praise on a yo-yo by describing it as ‘smooth’. Just weak.
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When I do a laceration bind and the string gets knotted up in the yoyo instead. I carry bread/wire ties in my bag though. Super easy to get them out. Still irksome though
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When I get a new pack of yoyo strings and they’re all intricately braided and twisted together in a fancy-looking way and when I try to pull one string out everything gets all tangled up and it makes me wish loose strings were just shoved into a baggie and sold to me that way. I guess I just lack patience.
Edit: I DO appreciate the effort that goes into the presentation of string packs. The problem is me and my impatience.
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I’m a different way, I feel so bad pulling these apart because they look so pretty
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I’m sure some people shelf queen string packs or don’t throw, just collect string packs. Neat hobby!
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Markmont Formula strings ordered direct were usually just bunched up and stuffed in to a muslin pouch.
Ultimately, this created the same situation: instant tangles if you pull one out impatiently.
I think the Zipline twisted coils are a better presentation, and at least there is the option of unwinding everything neatly (not that I ever do that).
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When pulling a string out of a bulk bundle, firmly hold the bundle at the bottom end while pulling the string out the top so that you are basically pulling the two away from each other. Keeping the ends all together with your one hand prevents them from being pulled up into the bundle with the chosen string and bunching, instead this lets selected string slip out through everything once it’s past your grip on the bottom.
I hope that makes sense
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Personally, someone suggest to pull from the middle. Works like a charm 90% of the time (don’t worry about that 10%; skill issue)
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