Fraction Bars "Wiener Bruchrechentafel"
thingiverse
Educational Tool for teaching Fractions to the Blind. Original design dates back to 1910 or earlier. Idea to recreate the design for 3D-printing by Golan Levin. Discovery of original design and CAD model by Martin Schneider. Source: Archive.org Alexander Mell, Der Blindenunterricht. Vorträge über Wesen, Methode und Ziel des Unterrichtes in der Blindenschule, 1910 Instructions Instruction This is just a first quick draft. You probably need to adjust minimum thickness and gaps for this to work on your 3D printer. I didn't have the opportunity to 3d print this, yet. In case you do, please let me know how it worked out! Possible Improvements 3D printing-friendly layout in bars-only mode Allow for hollow frame + bars
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