3D CAD designs and relevant artifacts
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nakamochi 3D designs

the repo contains 3D models of parts used in the nakamochi project.

those design sources which are made with freecad use a version no older than v0.20. a stock installation of freecad should be sufficient but you might want to install fasteners workbench if working on a design assembly.

DIY version (FFF)

fused filament fabrication design is suitable for 3D printing at home, located in the fff directory. the main file is in fff/provcase.FCStd. "provcase" stands for "provisional case" because it was unclear at the time whether this would have been the final version.

the project contains all the parts to make a full assembly with the following BOM:

all object constraints reference an embedded spreadsheet params to avoid topological naming problem. prefer constraining against datum objects instead of faces and other elements produced directly from sketches like pads.

finally, the fff/provcase-assembly.FCStd file contains an "assembly" group. this is simply a collection of parts composed together to help visualize how and whether all of them fit well together. it links to the provcase.FCStd, so you'll need both files. this assembly group calculates all placement offsets from asmsheet spreadsheet. here's how the assembly looks like:

provisional DIY case assembly complete DIY build

the "assembly" std part has a custom property "view" with two options: exploded and assembled. the property is configured from the same asmsheet.

3D printing the parts

TODO: insert here acceptable 3D printer specs and an assembly guide

DIY+ (plus)

this version features a custom heatsink combined with the bottom plate, suitable for aluminium CNC milling. the construction provides a better heat dissipation compared to the DIY (FFF) version.

DIY+ assembly unboxed exploded DIY+ unboxed assembled
DIY+ assembly DIY+ assembly boxed
DIY+ temperature during IBD the baseplate serving as a heatsink brings down the main CPU temperature from around 70℃ to 50℃. when measured externally while doing bitcoin initial blocks download, an IR camera showed around 36℃.

the main file diyplus.FCStd contains all parts as well as the assembly. other files in the diyplus directory are exports from the main file, such as baseplate DXF, STL, STEP and drawings.

a complete assembly BOM is as follows.

off the shelf parts

other parts, harvested from the above list:

  • 2 self-tapping screws 2.9mm L3mm (from the SSD)
  • 1 screw M2.5 L5mm (from the LCD)
  • 4 PCB standoffs M2.5 L30mm (from the LCD)

custom parts

TODO: assembly instructions


various files are placed in the assets to use in an assembly composition. for example, you'll find a 4.3inch display, raspberry pi 4 and a heatsink in there.

when creating a design assembly, make a new std part group and import desired assets into it. if an asset is in a freecad file format, open the file and drag&drop the top level object into the newly created std part. then close the original file ignoring the changes.


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