Stellar Size Comparison - Main Sequence Stars

Model Overview & Print Notes

Discover how different stars compare in size with this hands-on 3D printable educational model set.   From tiny red to enormous blue stars, this collection helps visualize the incredible scale differences between stars in a simple, tactile, and intuitive way.   Designed for STEM learning, classrooms, homeschool activities, science outreach, and curious minds of all ages. What’s included Scaled star models representing different stellar types Spectral class labels (O, B, A, F, G, K, M) An educational Hertzsprung–Russell (HR) diagram (see pictures) Multi-plate printable setup optimized for AMS & no AMS The models are scaled using approximate stellar radii, with the Sun represented as a 2 cm sphere.   Approximate model diameters: Spectral type Model diameter M 1 cm K 1.7 cm G (Sun) 2 cm F 2.5 cm A 3.2 cm B 9 cm O 14 cm Learn through physical models This set helps demonstrate how: star size changes across stellar types color relates to temperature brighter stars are often much larger our Sun compares to other stars The included HR diagram helps connect these ideas visually and makes the models especially useful for tactile and interactive learning. Perfect for: STEM education classrooms homeschool learning science fairs astronomy outreach museums and displays space enthusiasts of all ages Printing notes Larger spheres are optimized for lightning Infill to reduce material use and print time Supports are not required Multi-color printing is optional Designed for easy and reliable printing The letters shown in the preview images were created using my parametric model: Custom Letters, Numbers & Name Tags (OpenSCAD) .   UPDATE May 2026: Plate holders for all star types added. Recommended settings PLA recommended Variable Layer Height Lightning Infill recommended for larger spheres If you print the set, feel free to share your make — I’d love to see how you use it in classrooms, workshops, or astronomy displays 🙂

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