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Perpetual calendarPerpetual Desk Calendar – 3D PrintableAdd a modern touch to your desk with this stylish perpetual calendar featuring rotating date, month, and weekday wheels. Designed for easy daily use, it combines a clean contemporary look.The model is optimized for PLA printing and assembles easily after printing. Depending on your printer's tolerances, you may need a small amount of glue to secure the two semi-moon body pieces together.Feel free to get creative with the colors! Print it in a single co
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Addition and subtraction demonstration mechanical deviceBoost MeThank youBoostA mechanical device for demonstrating addition and subtraction, designed specifically for young children's mathematical enlightenment. By using a hand cranked gear linkage structure, the principle of addition and subtraction is intuitively demonstrated, turning abstract numbers into visible mechanical motion.Additional accessories required: Φ 4 × 3mm circular magnet × 50, the magnet contact surface needs to be assembled with opposite poles.It is difficult fo
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