𞋴𝛂𝛋𝛆

  • 55 Posts
  • 364 Comments
Joined 2 years ago
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Cake day: June 9th, 2023

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  • Add some z hop. A fast move is likely contacting a lifted spot or some ooze. I have had this happen before. It can move the plate or skip steps in the motor which is undetectable unless you see it happen. The belt does not need to slip; only enough force to overcome the motor step fields’ strength is required. During fast movements, it is likely skipping some steps or transitioning from full steps to micro stepping which can create potential vulnerable points where the holding field strength is less than ideal in a compromise to create faster accelerations/decelerations. You have got to remember that 3d printers are cheap largely because they are not absolute position linear systems. All motions are relative to (0,0) home. The (0,0) home location is precise, but it is not accurate at all. Every step the machine makes is only ever precise but is accurate relative to the (0,0) home location. Therefore any skipped steps are catastrophic. The primary issue that causes this is that the steppers are in an unknown position upon first powering them up and they move randomly to whatever field step position happens to be closest. Likewise, all end stop methods do not trigger accurately to within a single step field position. It gets complicated to actually make an accurate linear system for things like IDEx or CNC.



  • Yes actually. It is a great hot fix for car stuff. With my auto body shop, I always carried a few feet of tie wire and a Leatherman because I often dealt with damaged fresh auction cars that I just needed to get to the shop in one piece.

    I worked for some good and some sketchy used car dealers. There were many repairs where the absolute cheapest minimum fixes were required. These were often Buy-Here Pay-Here car lots where the cost is kept low, the cars are not great, and the loans are predatory, but they will finance absolutely anyone. I won’t get into the really bad parts, but these places suck and are a product of the exploitive Republican South in the USA, and target minority communities. Most of their cars get repossessed many times over, and while these are supposed to be auctioned to levey the recovered cost against the loan, there are major loopholes. Like the law is not worded in a way that excludes the previous auction price paid by the owner. It also allows for deductions of costs related to preparing the vehicle for auction and transport… Lots of sleazy stuff happening there.

    Anyways… I got the same cars to work on over and over for years from one of those dealers. I often used tie wire to fix trim parts and stuff. It holds better than many actual fasteners.

    In fact, when I did pit for a dirt track sprint car, nearly every fastener on the race car has a hole drilled into the bolt shaft above the nut with a bit of this same tie wire pushed through and twisted. Lots of aviation stuff has the same. Cotter pins are a thing. Like your vehicle’s tie rods have a cotter pinned castle nut, which is basically the same thing but a pin that is less prone to corrosion in the long term. Still, tie wire will last years and 50k-100k miles even in bad weather and conditions.

    When I repair stuff like a plastic bumper cover that is torn or in pieces, I often used tie wire to stitch align the pieces exactly where I want them. Then I plastic weld repair the back side by embedding the stitched cross part of the wire in a special way. The wire becomes part of the reinforcing structure. Then I clip the wires where they went through from the back, remove the front part of each stitch, and cosmetically repair the crack and stitching holes in the plastic.






  • I think the only reason I might consider getting a SLA printer in the future is for making buttons, switches, and very small mechanisms. FDM is not very good for these in my experience so far, though I haven’t tried to print them with something like a 0.25 mm nozzle yet. The interface angles and texture have a very large impact on how a button slides into a small button on a circuit board and or is even more sensitive when the printed button is depressing a metal switch dome on a PCB.

    Are there any really small SLA printers that have a rigged open tool chain for such an application? I care about stupid-tiny types of things like the buttons on the side of a phone.

    On my bucket list is to etch my own 4+ layer circuit boards and make some really small stuff at home just to say I can.



  • The issue in this area is actually that the screens are proprietary from those making them, but that leads to a criminal corporate culture down the line in most cases. The datasheets for most high resolution displays are locked behind nondisclosure agreements and not publicly available.

    I support all levels of open source, but that is a personal opinion and not anything mod or community related here. I’m not monolithic in my hobby interests so I expect to put things down and return to them at will. That is not compatible with any subscription nonsense. The SLA space seems dominated by such subscription schemes IMO. Big messy projects or large spaces for stuff are not something I can do, so I am probably biased from that angle too.


  • Anyone that is monolithic in a space without broad scope comments and presence is fake or potentially dangerous. No one would be posting in Lemmy, in this context of supposed community building without having a presence here. There are several people that come to mind that could legitimately post that they are “the fediverse Squid Legend” but all of these have a major footprint on Lemmy.

    There is also a sketchy tracker link attached to the images, but I don’t think any of us are really able to say what exactly is happening with this. Like I finally got one of the messages a few days ago and my whitelist firewall logged the sketchy link. Someone else scanned that link in a security context which flagged it as suspicious. As far as I know, that is all that is known about what is underpinning the messages from the network side. Admins likely know more.






  • We need some kind of subletting system. Package a stupid simple Raspberry Pi image with the minimal amount of configuration required for me to self host, and set up a fediverse based DNS and certificate authority. Make it stupid simple for a user like me to self host my traffic without needing to pay for a domain and sort out all of the requirements. Like I technically have money but don’t control my finances and am heavily subsidized by family due to my situation and disability. I could probably set it up if I was super motivated but networking complexity is a rabbit hole that feels intentionally convoluted and a pain in the ass every time I mess with it. Locking down a Linux image with an immutable base and well configured PAM, SELinux, and automatic updating is equally daunting when a person has no experience or professional contacts familiar with the setup to ground one’s understanding.

    I don’t see why we need to rely on the traditional internet infrastructure. We should be able to make something like fediverse.lemmy.user.j4k3 where we collectivise the address fediverse.lemmy, use it as a DNS server, and then distribute the traffic to individual servers.


  • I haven’t looked into the issue of PCIe lanes and the GPU.

    I don’t think it should matter with a smaller PCIe bus, in theory, if I understand correctly (unlikely). The only time a lot of data is transferred is when the model layers are initially loaded. Like with Oobabooga when I load a model, most of the time my desktop RAM monitor widget does not even have the time to refresh and tell me how much memory was used on the CPU side. What is loaded in the GPU is around 90% static. I have a script that monitors this so that I can tune the maximum number of layers. I leave overhead room for the context to build up over time but there are no major changes happening aside from initial loading. One just sets the number of layers to offload on the GPU and loads the model. However many seconds that takes is irrelevant startup delay that only happens once when initiating the server.

    So assuming the kernel modules and hardware support the more narrow bandwidth, it should work… I think. There are laptops that have options for an external FireWire GPU too, so I don’t think the PCIe bus is too baked in.