I used an old y rod axis (8mm in diameter, 330 mm long) from the MK3 as shaft.
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updated January 4, 2023

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Printed great! I modified the handles to be slightly longer to accommodate the longer rod I used. I also added "fuzzy skin" to the outside surfaces for a better feel.

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I think you forgot to list what you used to keep the roller attached to the handles.

Did you do anything to keep the handles from falling off the rod?