Borescope centering collar
thingiverse
Centering collar for borescope camera. 8.5mm internal diameter. 25mm outer diameter. The screw hole fits a M4x12 nut and bolt. Measure your actual camera diameter before printing and then scale up or down as needed. You'll want the internal diameter to be no more than 0.5mm greater than the camera's outer diameter. This model is a loose fit for an 8mm camera, but may require spreading with a screwdriver to work with an 8.5mm camera.
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