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420officialtoday at 12:27 AM8 repliesview on HN

I just did this to my MacBook not because of the sharp edge but because the pitting turns a sharp edge into a sawblade. Something about the grounding on on the frame when plugged in mixed with my sweaty hands leads to damage along this sharp edge on every MacBook I've ever owned.

See https://www.reddit.com/r/macbook/s/hbyVh5SJhw for another poor soul with the same caustic skin


Replies

CGamesPlaytoday at 1:29 AM

Oh is that why it happens? Was wondering why the spot directly under my wrist was pitted into a sawblade. I also filed it, though just enough to remove the pitting, nothing like the OP did.

It's easy for me to feel the mains frequency while gently rubbing the top surface of the MacBook while it's plugged in. Really feels unsafe, but neither me nor the computer have suffered any serious injuries yet.

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al_borlandtoday at 1:00 AM

This comment is concerning.

> acidic sweat. once you got through the anodization the raw aluminum wears faster....

If one files off the sharp edges, won’t the sweat eat through everything faster, as that protective layer was filed off.

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esskaytoday at 7:56 AM

Huh, I've had that pitting with every magic mouse I've owned, the sides of it end up looking like a cheese grater...apparently my fingers are acidic!

dataviz1000today at 1:40 AM

I’ve been traveling around the world. It is 50 / 50 of the socket is properly grounded —-anywhere in the world. I get a tingling zap on the wrist when not properly grounded. The charger also gets hot and sparks.

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sanjtoday at 12:08 PM

I’ve noticed that this only occurs when I use a two-prong adapter for the power brick.

If I use the 3-prong, which is usually tied to a long cable, I don’t feel the buzz.

I assumed that the additional grounding helped.

Esophagus4today at 4:14 AM

So glad to know it wasn’t just me with sweaty hands and pitted aluminum that is razor sharp!

greazytoday at 1:20 AM

Oh wow I think I have a mild version of this.

Can it cause the plastic on the mouse to break down?

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chubstoday at 9:19 AM

Holy moly, that guy in the reddit post needs to see a dermatologist asap and figure out why their skin is emitting acid.

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