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The least expensive Shimpo banding wheel right now is $155. So I 3D printed my own as a test (this marvellous idea came from Crystal Bennett). The middle section is designed to fit inside the upper. To make it heavy, turn over the upper section, fill it to the brim with plaster, then press in the middle section until the plaster comes out of the holes (then weight it down till the plaster sets). The base is hollow, so it can be filled with plaster too. A standard 17x40x12mm roller bearing (available for $5 at the time of writing), it fits tightly into the recess in the middle section (and the base stem fits tightly inside of that). The resultant turntable turns super smoothly and rotates remarkably true. This drawing is parametric, so the dimensions can be adjusted easily. The size of the bearing that it will accommodate is also adjustable.
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