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# nakamochi 3D designs
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at the moment, there's only an FFF (Fused Filament Fabrication) design suitable
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for 3D printing at home in the [fff](fff/) directory.
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all design sources are made in [freecad](https://freecad.org/) no older than v0.20.
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a stock installation of freecad should be sufficient but you might want to install
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[fasteners workbench](https://wiki.freecadweb.org/Fasteners_Workbench) if working on
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a design assembly.
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## fff
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the main file is in [fff/provcase.FCStd](fff/provcase.FCStd). "provcase" stands for
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"provisional case" because it is still unclear whether this will be a final design.
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the project contains all the parts to make a full assembly with the following BOM:
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- [raspberry pi 4 model b](https://www.raspberrypi.com/products/raspberry-pi-4-model-b/)
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- [waveshare 4.3inch DSI LCD](https://www.waveshare.com/wiki/4.3inch_DSI_LCD)
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- [joi-it armor "block" heatsink](https://joy-it.net/en/products/RB-AlucaseP4+07)
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- [sandisk portable 1TB SSD sdssde30-1t00](https://www.westerndigital.com/en-in/products/portable-drives/sandisk-usb-3-2-ssd)
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all object constraints reference an embedded spreadsheet `params` to avoid
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[topological naming problem](https://wiki.freecadweb.org/Topological_naming_problem).
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prefer constraining against datum objects instead of faces and other elements produced
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directly from sketches like pads.
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finally, the [fff/provcase-assembly.FCStd](fff/provcase-assembly.FCStd) file contains
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an "assembly" group. this is simply a collection of parts composed together to help
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visualize how and whether all of them fit well together. it links to the provcase.FCStd,
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so you'll need both files. this assembly group calculates all placement offsets from
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`asmsheet` spreadsheet. here's how the assembly looks like:
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the "assembly" std part has a custom property "view" with two options: exploded and
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assembled. the property is configured from the same asmsheet.
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### 3D printing the parts
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> TODO: insert here acceptable 3D printer specs and an assembly guide
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## assets
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various files are placed in the [assets](assets/) to use in an assembly composition.
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for example, you'll find a 4.3inch display, raspberry pi 4 and a heatsink in there.
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when creating a design assembly, make a new [std part](https://wiki.freecad.org/Std_Part)
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group and import desired assets into it. if an asset is in a freecad file format,
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open the file and drag&drop the top level object into the newly created std part.
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then close the original file ignoring the changes.
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## license
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[CC-BY 4.0](https://creativecommons.org/licenses/by/4.0/)
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