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Cake day: August 15th, 2023

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  • I am making a slightly different point and have a bias to this perspective: https://www.legis.iowa.gov/docs/publications/SD/19230.pdf

    I am saying that an SSN can be part of a larger validation scheme, not the only key to the castle. Specifically for government sites, SSNs can be linked to IRS data to verify places of last residence. A person generally needs to verify multiple items that are referenced by the SSN before basic authentication can be established and set by the user. (This is part of the full Authentication, Authorization and Access Control triad.)

    An SSN is just a broad level identifier. If you look at many laws around the release of SSNs, the redaction is usually in place to prevent the linking of different documents and other data points.

    If I released my SSN in this chat, I could be fully doxxed in a matter of seconds. It’s mainly because there are many legal systems in place that use an SSN as a primary key, of sorts. (It’s a bit more than that, as SSNs can be duplicated in some circumstances.)

    So to say, at a high level, an SSN is considered private is absolutely correct. However, it’s so easily referenced and obtainable it really isn’t fully private either.

    If I was to generate a full list of every possible SSN in the US (which I have done, multiple times), that list is effectively useless to anyone who obtains a copy of it. So, by itself, an SSN is effectively public.








  • You could probably map resonance artifacts, but you have to isolate layers that were printed at the same speed and direction. However, the second you tighten a belt or screw, that pattern will change and I am not sure how consistent resonance patterns would be on a bed slinger. (The quantity and density of printed plastic may change the resonant characteristics of the entire printer. This may be less of an issue on a core xy.)

    Thinking waaay outside the box… In some cases, I have seen extruder gear marks on the filament create artifacts on a print. Every gear pattern should be unique, but measurable differences would probably be micron or sub-micron.

    Maybe you could map the surface of textured beds as I seriously doubt that those patterns would be consistent and more prone to randomness from the factory.

    There are a ton of conditions that could generate unique artifacts on a print, now that I think of it. Hell, even a printers PID tuning can leave visible and repeatable errors.





  • Totally. There is heat from repeated deformation, but I didn’t explain how little heat it was, so I clarified in a later comment. All motion creates heat, etc, etc. (TBH, I shouldn’t have mentioned it. Oh well. I let that cat out of the bag, so it’s too late.)

    But also yes, I have experienced PLA “cold flowing” on some parts as a well so I can confirm that for sure.


  • remotelove@lemmy.cato3DPrinting@lemmy.worldEnder 3 V2 damage?
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    1 year ago

    Keep in mind that any heat created from stress on plastic will still be minimal and it will just take lots of time to create visible deformation. You can mitigate this mostly by printing critical parts at 100% infill.

    I always over-engineer parts that are mechanical. That is just my preference. If you look at the original part, it is likely designed to be strong on only one axis. This saves money and time for bulk manufacturing. (Compensate home prints with better materials or bulkier printing is my own rule of thumb. Everything is a trade-off, is my point.)


  • remotelove@lemmy.cato3DPrinting@lemmy.worldEnder 3 V2 damage?
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    1 year ago

    I would say it was a combination of being too tight and the tensioner being made as cheap as possible. You don’t need the belts “rock solid” and I would check the bearings/bushings on the other end for damage too. Any kind of wobble is going to amplify enough to show on your prints, but if that matters is up to you.

    Also yes. It’s more than possible to print a replacement and I would check if there are better designs on Printables. Ideally, you want a metal one unless you print one out of PC or another strong, high temperature plastic. Repetitive bending creates heat and heat will eventually deform PLA or PETG. You will get a lot of repetitive motion on a tensioner. However, nothing really needs to be perfect, just temper any longevity expectations based on what you are willing to invest in time and materials.