Fraction Bars "Wiener Bruchrechentafel"

by bitcraftlab, published

Fraction Bars "Wiener Bruchrechentafel" by bitcraftlab Jan 3, 2014
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2171Views 461Downloads Found in Math Art


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



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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