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TootSweet

@ TootSweet @lemmy.world

Posts
28
Comments
1305
Joined
2 yr. ago

  • South Korea deploys hologram police officer to fight crime – and it’s working

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  • What I want to know is how does it work? Maybe a human silhouette of plexiglass onto which the image is projected? (Kinda like how they do Gorillaz concerts.)

  • Computer Science, a popular college major, has one of the highest unemployment rates

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  • My employer considers developers, infra, SRE, PC Support, even QA all to be part of the "IT department". I've always used the term "IT" to just cover any specifically "tech" sort of function. As opposed to, say, finance, sales, HR, operations, etc.

  • Ender 3 v2 and new to 3D printing

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  • So, basically, when you auto-home, that lets your printer calibrate itself with regard to the position of the print head on the X (left-right), Y (forward-back), and Z (up-down) axes, right? For each axis, it just keeps moving in the negative direction until it hits a switch. (An "endstop".) When it hits the endstop, it considers that "zero" for that axis.

    For the Z axis specifically, you have a couple of different options where you can put that switch. You can put it on the frame of the printer and position it such that when the print head moves down, the bar that the print head is on hits that switch at roughly the right place. That's a "Z-endstop". Or, you can put the switch on the print head so that it can be moved not only up and down but left and right and forward and back. That's a "Z-probe". (The "CR-Touch" is a specific brand of Z-probe sold by Creality.)

    With a "Z-probe" your printer can take Z-axis calibration values not just for the arm that the hot end rides back and forth on, but for multiple different spots on the bed. (Typically in a grid pattern.) So, for instance, it can check the front-right corner of the bed, the front-center, front-left, middle-right, middle-center, middle-left, back-right, back-center, and back-left. Once it's got values for all those spots, it can do some math to get a good approximation of the "shape" of the bed.

    Your bed ought to be close to flat, but typically beds -- or at least stock beds; again, I'm not sure about the glass beds -- will be subtly parabolic or hyperbolic or something. (Like, shaped like a bowl or a hill or a Pringle chip or some such rather than truly flat.) So if you have a Z-endstop and can't do calibration at multiple points on the bed, then your printer can only act under the assumption that the bed is flat. If your bed is actually (for instance) bowl-shaped, then the print head will be closer to the bed when the print head is far to the front-right, back-right, front-left, or back-left than it is when the print head is closer to the center. In that case, the best you can do is just kindof manually calibrate your Z-endstop offset until you've got the most reasonable compromise between too far from the bed when you're near the center and too close when you're near the extremities.

    (Sidenote: It's not 100% true that you can't get your printer to account for bed curvature if you only have a Z-endstop rather than a Z-probe. From what I've heard, there are ways to manually "probe" your bed to get figures for the shape of your bed and then give those figures to your printer's firmware to get your printer to account for bed curvature that way. But it's a big pain and may have to be redone a lot. It's been a while since I've looked into that option, but I think it may also have required rebuilding the firmware and stuff. As I said, big pain.)

    But with a Z-probe, the "auto-leveling" process, when it probes the bed in a grid, it can build a model of what shape the bed really is. And then as it prints, it can follow the curvature of the bed as the print head is moving in the X and/or Y direction in order to stay a very consistent distance from the bed, rather than getting further or closer to the bed (or perhaps it's better to say the bed is getting closer and farther from the print head) as the print head passes over "hills" and "valleys".

    When your print head is too far from the bed, it doesn't adhere well and there's increased risk of the part coming off the bed mid-print. When your print head is too close to the bed, you run the risk of underextrusion, clogs, and first layer expansion. But with a Z-probe, it'll be better at making sure you get the best of both worlds, and not just on part of your bed. On all of your bed.

    The Ender 3 V2 appears to come with a Z-endstop, not a Z-probe. (Just looking at the image on Creality's official page.) So if I got an Ender 3 V2, I'd add a CR-Touch immediately. (That said, again, the glass beds may have less issue with bed curvature, so it might not be so worth it with your glass bed. If you're successfully using most to all of your bed and not having adhesion issues or first-layer expansion, there's definitely no need to worry about it. But it wasn't until I got a Z-probe that I understood just how reliable my printer could be and how little first-layer expansion I could expect from it.)

    One thing to note. Bed curvature with a Z-endstop won't matter so much once you're a few layers in. It'll cause issues with the first two or three layers, but by the time you're up to five or so layers, it's not really an issue any more. Most of the issues I had with bed curvature with a Z-endstop before I got my second printer were that the print failed within the first few layers. Usually by popping off the bed rather than adhering as it should.

  • Removed

    If a fart was reverse-sublimated, what would be the resulting solid matter?

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  • I'm being trolled and I ain't even mad.

  • The warning signs the AI bubble is about to burst

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  • Removed

    If a fart was reverse-sublimated, what would be the resulting solid matter?

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  • Be serious, please

  • Ender 3 v2 and new to 3D printing

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  • My first printer (that I still have and use) is an Ender 3 Pro. My second is an Ender 3 v2 Neo.

    The Ender 3 Pro doesn't have a Z-probe or autoleveling. Just a Z endstop. When I got that V2 Neo, my whole world changed. I could use the whole bed without adhesion issues now!

    So I got the CR-Touch upgrade kit for my Ender 3 Pro, and it now works just as well.

    A Z-probe is definitely on my "cannot live without" list of features for any printer I get in the future.

    I usually prefer the stock beds, though, and I don't necessarily know whether warped (like, not just "not flat" but actually not planar) beds are when talking about the glass beds. That said, if you have issues with not being able to use the whole bed without adhesion issues in some parts of the first layer, I'd strongly suggest a CR-Touch.

    I had to upgrade the mobo on my Ender 3 Pro for the CR-Touch. Not sure whether you might have to for the V2, though.

  • Mark Zuckerberg freezes AI hiring amid bubble fears

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  • Well that news article title surprises me more than Cookie Monster switching to fruits and vegetables.

  • Do you feel sad for people born today?

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  • Yup.

  • Sterilised Toilet ☢️

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  • Literal shitposts are the best kind of shitposts.

  • Gavin Newsom tops Kamala Harris in 2028 presidential poll of California Democrats

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  • Ok, why do you think she lost the general election and the popular vote then?

  • Gavin Newsom tops Kamala Harris in 2028 presidential poll of California Democrats

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  • I mean... that's a pretty low bar, though, right? Kamala just set the world record for fastest time from hype to revulsion any politician has ever achieved and pulled her entire party along into the grave she dug herself.

  • Help getting my pug through the doogy door

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  • Physically pushing Louie all the way through the door (without lifting the flaps first; like using Louie himself to push the flaps out of the way in a way that mimics how dogs would ordinarily do it) a few times a day couldn't hurt.

    Also, if he's only been 4 days, it's likely he's kindof freaked out. It might be that as he acclimates, he'll naturally get the "confidence" to try it out himself.

  • What is an anti-hero?

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  • A good guy with the affectations of a bad guy.

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    Trump has dementia (Opinion)

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  • And I wish that was all he had.

  • At what (child's) age should parents let go?

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  • Not sure I fully understand the question. Is this about parents trying to push their adult children to live their life a certain way?

    If so, I'd say children should be allowed to exercise as much self-determination as can reasonably be afforded from pretty much toddlerhood, of course taking into account the danger of physical harm or lasting trauma. (Like, let your kid be interested in art at 3 years old and allow them to pursue it seriously as they get older even if you're a 4th-generation army brat. But don't let them jump off your roof at 3 to see if they can fly.) It's not so much that parents should "hold on" until a magic age is reached at which point they should "let go". If the parents are trying to get their 30-year-old son to quit being gay, or pursue a career in law rather than performance arts, or not play video games, or whatever, they probably weren't allowing for age-appropriate levels of self-determination when the kid was under 10 either and his raising could likely be described as an enmeshment sort of situation.

    If that wasn't the nature of the feud at all, then who knows who if anyone might have been in the wrong. Like, telling your 30-year-old son to quit stealing money from their 85-year-old grandmother is probably entirely appropriate.

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    A growing number of americans don't read newspapers. They get their news from online influencers. The right dominates the online ecosystem.

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  • Wow. How are Colbert and John Oliver not on that graphic? Meanwhile, I don't think I've ever watched more than three or four YouTube clips of Trevor Noah.

    Oh god, am I old?

    Also, it sucks that Brand's a right-winger. There was a time when I thought his heart was somewhat in the right place even if the execution was... questionable.

  • NSFW Deleted

    Permanently Deleted

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  • I just got this too. Using old Reddit (the realest Reddit (which still isn't saying much)) got rid of the banner and allowed loading all the content.

  • This one's for all the accelerationists out there

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  • Point taken, but nevertheless, don't let that sentiment lull you into the belief that this is the best we can do.