• 9 Posts
  • 133 Comments
Joined 1 year ago
cake
Cake day: June 11th, 2023

help-circle






  • I am not quite sure I’d be ready to recommend it, but your more adventurous patrons may want to experiment. These keycaps are PBT, a cousin of polyester. They are not particularly pleasant smelling when heated or especially when burned, but they’re not as unhealthy as ABS (the other common plastic for keycaps) and certainly not as bad as the straight up poison gas that comes from PVC. I use a basic 5W blue diode laser, coat the keycap with an “infusible ink” pen from Cricut (most of their infusible products are polyester-based), put it in an alignment jig, then laser a raster image “low and slow.” My particular laser seems to do best when I do two or three passes at 2% power and 45mm/minute. The idea is to heat it roughly in line with the crafting heat presses without letting the heat spread and color in areas beyond the beam. I experimented with actually burning or engraving, and that sort of works, but (1) it’s stinky, and (2) the ash wipes away and you’re left with a mostly colorless letter-shaped indentation. The “dye sub” technique produces barely any fumes at all. There are a few people on youtube who’ve tried similar techniques, and quite a few who have used different heat or dye sources.

    Aesthetically, the process was only marginally successful, though I’m optimistic about the longevity, at least compared to other low-end manufacturing techniques. I’ve been using a similar set of home-lasered keycaps for about a month with little to no wear. My jig was not as good on that set, AND I tried to center the keycap legends, meaning every fraction of a millimeter was painfully obvious. These legends didn’t end up exactly where I might have liked either, but they’re all off by the exact amount (about 1mm), so being consistent, the alignment isn’t too bad.






  • At my rather beginner level, designing single parts for a 3D printer or laser engraver, it behaves almost exactly like most other parametric-history CAD apps in the broad concepts. The devil is just in the details, really. Shortcuts are different, terminology is different, Certain QoL and UI elements are either missing or somewhere else. The workbench model is not unique, but some of the kruft that has built up around FreeCAD’s benches and the defaults (better in recent versions if you look at the start screen) can make a new user “nope out” if they have other options. I guess assemblies in particular remain a fragmented area and lag behind the commercial packages, and I can say for certain that it still requires “good design practices” in a way that some of the commercial apps manage around, toponaming the biggest among them.

    If all the negatives kill your workflow to the point that you want to pay for commercial software or live with the limitations (current and potential) of their free tiers, then that’s absolutely understandable. Commercially, it’s doubly so, and with addition of the “business reality” that there’s also no one to blame or sue if FreeCAD is not working for you. Hell, I don’t use it for all my stuff either, as I find no-history modeling still mostly works for what I’m doing and I have some free or cheap options in that space that are decent, but I can see the appeal as I’m starting to make things that could benefit from tweaks after the fact. What I get frustrated by is claims that FreeCAD “is no good” or “will never be useful”. I call BS. It’s already good and useful for many use cases, and anyway the number of free parametric CAD suites that do not restrict your use of your designs is exactly ONE. Otherwise, you’re looking at an absolute minimum of $300 a year to subscribe and hope that Shapr3D’s new history functionality doesn’t break, and that neither they nor Alibre gets gobbled up.









  • The sense I get is that it is more lazy than anything. The verbiage feels like the fact that designs were public documents was tacked on last minute to satisfy some desire for market segmentation or to create a parts and design library to draw traffic. It would make sense that the company hosting the software would not want the headache of being unable to use your stuff commercially or even of parsing what they could use, since in some sense they always are using everything commercially. Refusing the to thread the needle with their verbiage, though, has left a situation where the Terms of Use say clearly that (1) a design is Content, (2) a free user’s Content is a public document, (3) a free user cannot use their own public documents for commercial use, and (3) a free user grants EVERY OTHER USER a license to sell their public documents.

    1. “End Users’ files, designs, models… (collectively, “Content”).”
    2. “All documents created by a Free Plan User, and all Content contained therein, is made public and therefore considered a Public Document.”
    3. “If you intend to use the Service outside a trial context to create and/or edit intellectual property for commercial purposes (including but not limited to developing designs that are intended to be commercialized and/or used in support of a commercial business), then you agree to upgrade to a paid subscription to the Service.”
    4. “For any Public Document owned by a Free Plan User… Customer grants a worldwide, royalty-free and non-exclusive license to any End User or third party accessing the Public Document to use the intellectual property contained in Customer’s Public Document without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Document, and to permit persons to whom the Document is made available to do the same.”

    The only possible wrinkle is that the ToU distinguish between a “Customer” and an “End User,” so maybe you the customer can grant you the End User the same commercial rights that Joe the slightly shady CNC machinist in Peoria has when he downloads your widget to fabricate and sell. Something tells me that PTC’s license compliance folks don’t interpret things that way, though.