Parametric spool bearing bushing
thingiverse
In my initial project, I crafted a non-cylindrical octagonal bushing due to unavailability of the correct fit for an ABS spool (52.5mm inner diameter) and standard 608 bearings. The parametric design in OpenSCAD allows simple modification of both diameters (inner and outer). The STL file is tailored for a 52. 5mm spool/22mm bearing fit. To assemble, insert the bearings into two instances of this part using standard 8mm threaded rod as the spool axis, and secure with nuts from outside to fix bearings on the axis.
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