This design is intended to help children visualize fractions through size comparisons. The six circles are comprised of the fractions 1/2, 1/3, 1/4, 1/5, and 1/6 along with one solid circle. This is intended for grades Pre - 2.
The designs for each part were done in FreeCAD and uses approximately 67g filament (~$1.34 to make with PLA). This is based on the wooden design sold for $30.99: https://www.etsy.com/listing/661907826/montessori-fraction-circle-puzzle-wooden?gpla=1&gao=1&utm_campaign=shopping_us_NafeesCreationsUS_sfc_osa&utm_medium=cpc&utm_source=google&utm_custom1=0&utm_content=15536406&gclid=CjwKCAjw9L_tBRBXEiwAOWVVCUyLIbS-xS1GyZ4TgqN6S01Ss4aGVLTGTChrjl7Amnnkx_QRFHvEuBoCY0cQAvD_BwE