Stand back - I'm going to attempt math!
thingiverse
A personalized version of http://www.thingiverse.com/thing:40705 has been created using the Customizer at http://www.thingiverse.com/apps/customizer/run?thing_id=40705. For customization, options include Font set to 'write/Letters.dxf', icon rotation at 0 degrees, icon size of 11, manual length of 100, emboss style as 0, sign size of 0, manual width of 100, icon usage as 'Yes', hole radius at 2.5, font one size at 60 and font two size at 30. The messages displayed are "Stand Back!" and "I'm Going to Attempt MATH!".
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