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# nakamochi 3D designs
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the repo contains 3D models of parts used in the nakamochi project.
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those design sources which are made with [freecad](https://freecad.org/)
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use a version no older than v0.20. a stock installation of freecad should
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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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## DIY version (FFF)
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fused filament fabrication design is suitable for 3D printing at home, located
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in the [fff](fff/) directory. the main file is in [fff/provcase.FCStd](fff/provcase.FCStd).
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"provcase" stands for "provisional case" because it was unclear at the time whether
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this would have been the final version.
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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][rpi4]
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- [waveshare 4.3inch DSI LCD][lcd]
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- [sandisk portable 1TB SSD sdssde30-1t00][ssd]
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- [joi-it armor "block" heatsink](https://joy-it.net/en/products/RB-AlucaseP4+07)
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- 90 degree angle [USB-C adapter][usbc90deg] 3.1 gen 2, 10Gbps
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- adhesive gasket/seal tape for LCD, 1mm thick, 10mm width, L370mm
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- 4 screws M2.5 L16-18mm for heatsink mount
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- 4 spacers 2-4mm thick depending on the heatsink mount screws length
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- 4 adhesive bottom pads
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- [enclosure main box](fff/box.stl), 3D-printed
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- [enclosure side cup](fff/sidecup.stl), 3D-printed
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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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---|---
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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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## DIY+ (plus)
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this version features a custom heatsink combined with the bottom plate, suitable
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for aluminium CNC milling. the construction provides a better heat dissipation
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compared to the DIY (FFF) version.
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---|---
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<img alt="DIY+ temperature during IBD" src="diyplus/ir_1166.jpg" align="right">
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the baseplate serving as a heatsink brings down the main CPU temperature
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from around 70℃ to 50℃. when measured externally while doing bitcoin initial
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blocks download, an IR camera showed around 36℃.
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the main file [diyplus.FCStd](diyplus/diyplus.FCStd) contains all parts
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as well as the assembly. other files in the [diyplus](diyplus/) directory are
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exports from the main file, such as baseplate DXF, STL, STEP and drawings.
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a complete assembly BOM is as follows.
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**off the shelf parts**
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- [raspberry pi 4 model b][rpi4]
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- [waveshare 4.3inch DSI LCD][lcd]
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- [sandisk portable 1TB SSD sdssde30-1t00][ssd]
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- 90 degree angle [USB-C adapter][usbc90deg] 3.1 gen 2, 10Gbps
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- adhesive gasket/seal tape for LCD, 1mm thick, 10mm width, L370mm
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- 3 thermal pads 1.5mm thick, 424mm sq total area - see baseplate drawing
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- 7 screws M2.5 L10mm
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- 4 adhesive bottom pads Ø5mm, 3mm+ thick
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[rpi4]: https://www.raspberrypi.com/products/raspberry-pi-4-model-b/
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[lcd]: https://www.waveshare.com/wiki/4.3inch_DSI_LCD
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[ssd]: https://www.westerndigital.com/en-in/products/portable-drives/sandisk-usb-3-2-ssd
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[usbc90deg]: https://www.delock.de/produkt/65915/merkmale.html
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other parts, harvested from the above list:
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- 2 self-tapping screws 2.9mm L3mm (from the SSD)
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- 1 screw M2.5 L5mm (from the LCD)
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- 4 PCB standoffs M2.5 L30mm (from the LCD)
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**custom parts**
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- [baseplate](diyplus/baseplate_techdraw_c.pdf), CNC milled from aluminium
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- [enclosure box](diyplus/box.stl), 3D-printed
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- [SSD support plate](diyplus/ssdsupport.stl), 3D-printed
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- 3 [spacers](diyplus/spacer_3x2.4mm.stl) Ø3mm hole, 2.4mm thick
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> TODO: assembly instructions
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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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