Brachial Plexus Anatomy Model

I made this brachial plexus model specifically for mass 3D printing and distribution to med students. The overall shape takes inspiration from Netter's, but with extensive subtle design choices which make printing up to 10 at a time per printer possible with minimal material waste.  This makes printing out dozens or a hundred models for distribution as study aids feasible with some reasonable prep-time. I recently printed a batch of 70 of these for a class, and they are incredibly well-received as tactile study aids that students get to keep.

Features

• D-Shaped Cross Section: The nerve branches feature a D-shaped profile. The curved side provides necessary structural stability for the tall print, while the flat face provides a perfect surface for writing and labeling.

• Stylized Base: The model's feet are a stylized merger of the dorsal root ganglion and ventral roots, but their primary mechanical purpose is to keep the tall model standing stable on a desk.

Labeling and Use

Sharpies and other markers will bleed pretty bad along the layer lines.  I suggest using acrylic paint or paint markers (as seen in the photo).  Alternatively, you can use colored tape or string to label the branches you're trying memorize.

Slicer Settings

This model is tall, lanky, and requires specific settings to print well:

• Printer: I don't recommend using a bed-slinger.  This was designed for the Core One's print dimensions.

• Perimeters: 2

• Infill: 0%

• Supports: Organic/Tree supports are required. Be sure to "merge entities" in your slicer so the organic supports can route efficiently across the entire nested set.

• Overhang Threshold: Set your support overhang generation to at least 35 degrees. The resulting support trees will act as essential vibration damping for the upper reaches of the model.

• Surface Finish: The tall, thin nature of the print makes it susceptible to slight printer vibrations, which causes horizontal banding.  Adding a small fuzzy skin masks these artifacts.

Licensing

This project uses a split Creative Commons license to maximize educational use while protecting the open design:

• 3D Model Files (.stl, .3mf, etc.): Licensed under CC BY-SA 4.0. You may modify and redistribute the 3D files, but you must attribute the original author and share your modifications under the same ShareAlike license.

• Physical prints, Photos, Diagrams, Slides, and Documentation: Licensed under CC BY 4.0. You are free to use, adapt, and embed these derivative works into any educational, commercial, or proprietary materials. You only need to provide appropriate attribution.