Over Engineered - Object Permanence Box V3 (OpenSCAD)
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This infant toy is pattered after the one used in Montessori schools. The OpenSCAD source file is included.
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Object permanence is the understanding that whether an object can be sensed has no effect on whether it continues to exist. This is a fundamental concept studied in the field of developmental psychology. You can read more about it here: https://en.wikipedia.org/wiki/Object_permanence
This infant toy is an over engineered version of the Montessori Object Permanence toy. The little kid sits next to the toy and picks up the ball then drops it in the hole. Kids at the right stage in development are thrilled with this toy and do it many times in a row. Apparently their brains need the repetition to learn what is going on.
But in this over engineered version, the ball goes around in a spiral before coming out. This causes more noise and a longer delay as compared to the standard Object Permanence Box. If you print in translucent plastic, you can see the ball descend in the spiral. It's hard to see the internal structure, so I've provided a picture of the hole and also a cut away view. Another way to see the spiral is to look using the 3D viewer in x-ray mode.
Print with manual supports on the exit hole. See the 3MF file.
No assembly required.
Version 1 square
Version 2 rounded
Version 3 tall spiral (this page)
Version 4 taller spiral with slot window