Calcu 3 TI-30X Pro
thingiverse
This is the new Calcu 3. It was dessigned to holds a 16cm Aristo set square, a pencil (or pen) and the Texas Instruments TI-30X Pro MathPrint. You should wear it aon your belt. Fun fact: In my school (which is in Austria) we call it the "Strebergürtel" in english: Nerdbelt.
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