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  • M4xM4x@chaos.social
    Nov 28, 2025, 8:06 PM

    It's #FreeCADFriday again! 🥳

    I've continued my work on the DIY twitter box.

    I tried to save some time by buying a 18650 battery holder. Unfortunately, it was nearly impossible to get the battery out again (it has a protection circuit).

    That's why I've modeled my own and ordered suitable battery contacts which get inserted into the designated slots at the ends.

    Please tell me it's okay to build my own battery holder ... :blobpats:

    #FreeCAD #CAD #3dprinting #battery #diy

    Cc @FreeCAD

    Screenshot from FreeCAD. Gray background. The base (basically a box without a lit and some cut outs) is yellow. The battery holder is red and inserted at the bottom of the base.
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Replies

  • alpha1betaalpha1beta@libretweet.com
    Dec 3, 2025, 5:35 AM

    @M4x Not an electrical engineer but there are fire retardant PLA and ESD safe filament (as well as High temp filament). I suspect these would at least make it safer.

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  • M4xM4x@chaos.social
    Dec 3, 2025, 6:27 AM

    @alpha1beta ESD is relevant for the electronics. But I'm not worrying about breaking it. I've used ESD safe filament in the past.

    Junction boxes (for the 230V grid for example) has to be made out of material which is hard to inflame / self-extinguishing (V0). I don't know if such materials exist for 3D printers.

    3D-printing bubble: Does anyone know something like that?

    #3dprinting

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  • dr.-ing. ⁡jasegjaseg@chaos.social
    Dec 3, 2025, 6:47 AM

    @alpha1beta @M4x For a junction box, I’d prefer other plastics over PLA due to PLA’s very low glass transition temperature. There are flame retardant PETG and other polymer filaments.

    ESD safety doesn’t matter for either electronics enclosures or electrical junction boxes outside of laboratory or explosion hazardous environments.

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