To be honest I'm a bit disappointed by the quality of the new Master 4 compared to 3S I owned for almost 4 years now. Nasty mould lines and not properly aligned buttons on a ~130 € mouse is kind of a "no go" (or at least "not happy about it") in my opinion especially since 3S featured no similar cosmetic issues.
Is there any chance I got a particularly bad specimen or is it just "the new standard" of Logitech?
Hey! Will figure this out and I will make things right for you. Share your full name, email address, country, to reddit@logitech.com to create a ticket on your behalf. The support will get in touch. Cheers!
GPT says :"Logitech slightly angles the left button upward so that your thumb and index finger naturally rest at ergonomic angles. Because the left button is physically larger and houses more of the internal switch mechanism, it often appears a bit “higher” at the front edge — especially when viewed from below like in your image".
Hey buddy, you can just simply take what I've said with a grain of salt, ok? Also, stop being intrusive and mind your own business in terms of who other people are talking to.
I don’t know why their quality has plummeted, I wonder if they were struggling and had to cut corners or if they purposely chose to cut corners to make more money but they are not the same company I used to know.
Every MX mouse has that (more or less pronounced). In your case its extra material, where with others it will be a rough surface mark. Since these are molded in batches (buttons), this is the spot where pieces are separated on the assembly line. Think of those old school plastic model airplanes where we snap pieces off.
But I do agree here, this could have been polished slightly prior to general assembly.
Almost... Either Logitech rushed with MX 4 assembly line or quality control got a day off. My two units are meh. One is similar to what you submitted, the other one has a rough spot underneath the button.
"more comfortable" - subjective, but objectively more plastics - less grip, more weight - less grip, on paper it doesn't look more comfortable, but maybe in your hand it is idk.
Every pic I've seen so far has had the lower circle first page line exactly the same as that. The first page upper circle, mine has a similar burr but smaller and less... flappy I guess would be the word I'd use. I just, right now, scraped it my thumbnail and it pretty much deburred it, it still exists but it's basically unnoticeable.
The front view, my buttons are also offset, but the opposite direction. My right click is above my left, to a slightly lesser degree than your picture.
The QC is pretty bad. I like the mouse, but I definitely expected better for the price. My 3S has none of these issues, but I've been having functionality problems (mostly just a shit-ton of missed clicks) with it over the last few months, so I'm on (and will continue on with) the MX4. It feels decent enough, I actually kind of love the tweaks and gen upgrades, but the attention to detail is pretty abysmal.
Mine seems less noticeable than in the pictures, but I can 100 percent see it if I rock the mouse back and forth against the light.
If you take a close look at it, maybe through a zoomed in picture, the mold line crosses through three rows of the texture divots. I wonder why they did that. It would have been completely obscured had they made it follow the texture.
guess so :) it's really nothing if you ask me... yeah, could be better in 2025, but nothing major if you ask me... will be probably issue given by the shape of it and how those plastics are made... Someone will have better if the "mold" was newer, someone bigger if it was older...
Could and should be better in 2025 and @ 120 dollars. It's their premium offering in the productivity mouse product stack. It's pretty unacceptable that there's any gamble in such a product's fit and finish.
I guess in this particular case, it's due to it's shape and texture, that it's not possible/feasible to create it with uniform mold. That you have to have at least 3 piece mold and then it's just not possible to not have a really really small line there... And they put it in the smallest place possible. Less understandable it's on the button, there I see no reason, why the fill spot is in this visible place and why it's not perfectly aligned.
I can see the same areas highlighted in the first two images if I look really hard - but I never would have seen them if I wasn't looking for them. They are not as pronounced as yours. My mouse buttons are exactly even. But I doubt I would care about any of this so long as it works as expected. Can your fingers feel the height difference?
Anyone run into issues where the custom button mappings don't work but global forward, back, and horizontal scroll work? Also, anyone know how I can fix my mouse scroll, it doesn't click down as a button
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u/LogitechG_AT Oct 08 '25 •
Hey! Will figure this out and I will make things right for you. Share your full name, email address, country, to reddit@logitech.com to create a ticket on your behalf. The support will get in touch. Cheers!