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Progenitor of the Weird Knife Wednesday feature column. Is “column” the right word? Anyway, apparently I also coined the Very Specific Object nomenclature now sporadically used in the 3D printing community. Yeah, that was me. This must be how Cory Doctorow feels all the time these days.

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Joined 2 years ago
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Cake day: July 20th, 2023

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  • Not to be a stereotypically insufferable Stallman style neckbeard about it, but the only two objectively correct answers to this question are FreeCAD for mechanical parametric things, and Blender for organic shapes or decorative models. (You can also bully Blender into doing parametric CAD work with plugins. And I guess OpenSCAD also counts, if you would rather program your models rather than model your models.)

    All of the other available commercial options are some combination of:

    • Proprietary vendor lock-in bullshit
    • Subscription model “software as a service” perpetual money sinks
    • Always online cloud services that either steal your models/make them available to anyone/probably also report you to the Feds
    • Loaded with quasi-legal licensing restrictions that prevent you from distributing or selling your own creations made with it

    Or for extra bonus points, all of the above!

    FreeCAD isn’t exactly slick and it has a rather precipitous learning curve, but it’s also basically the only viable truly free option that won’t spy on you, steal your stuff, or turn you upside down and shake you for money on a monthly basis.








  • It’s already a truck.

    Sandbags are remarkably effective at stopping small arms fire, at least as long as you can keep the sand in them. If you only stacked up the back wall of the truck right in front of the door and optionally if you only did it to waist height (you’d have to lie down behind them) it would absolutely work.

    A typical hardware store sandbag is 60 or 80 pounds, and to stack up to a height of, say, four feet you’d probably need around 3200 pounds worth of them or so (40 bags) based on some rough back of the envelope math and hazy recollection of the approximate size of an 80 lb bag of sand. That may exceed the recommended load weight of your small box truck per the rental agreement paperwork or whatever the hell, but I don’t think in reality that would cause even a small U-Haul truck to struggle much.

    Doing all four walls of the rear of the truck would probably take an inordinate amount of sand and wouldn’t be too viable.








  • Many folks don’t realize because the common usage doesn’t work that way, and to muddy the waters further the laws are written in many jurisdictions such that “assault” is used as a legal term of art which requires some manner of physical contact between the perpetrator and victim. DC specifically treats assault and threats of bodily harm separately, (source) but the penalties are the same and in fact refer to the same paragraph anyhow, so the net difference in this case is kind of moot.

    In some jurisdictions there is no such thing as “battery,” and assault is the attack while threatening is the threat. This may or may not have something to do with dumbing down the wording at some point for the layman. I’m not a lawyer despite the occasional insinuation to the contrary, so I’m not qualified to speak on that possibility.


  • The Qidi Q2 has built-in spaghetti detection (and print failure detection in general), auto leveling, bed mesh compensation, etc. It’s not a print farm machine, though, so how you’ll get your parts off the bed and into your finished bucket will require some outboard tools and elbow grease. If its mechanicals are anything like my prior X-Max 3 from them I don’t predict it will require any adjustment, maintenance, or parts replacement for many hundreds/thousands of hours of runtime. I guess eventually you’ll need a nozzle at minimum, and you might want to lubricate the linear guides on the gantries every now and again.

    It’s also compatible with their “Qidi box” filament changer doohickey if that sort of thing is important to you.