Calcu 3 TI-30X Pro
thingiverse
This is a belt holder for the Texas Instruments TI-30X Pro MathPrint, but you can also put a set square and a pen in there. Fun fact: In ,y school in Austria we call it the "Strebergürtel". In english that would be the Nerdbelt. When you want that the calculator can´t fall out, you might need to glue little peaces of felt in it, to make a perfect fit.
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