SCT Telescope Cap and Plug
thingiverse
I originally designed these covers as a perfect fit for a Celestron 0.63X focal reducer/corrector lens, but they've proven versatile enough to seal anything with SCT threading flawlessly. I now use them to seal the back of my C8, and they also make excellent caps for my SCT filters and diagonals. Custom threads used in these covers are specified as 2"-24 TPI in the Fusion 360 XML file, but a small adjustment is required to get the perfect fit - simply offset all four faces of the thread by about 0.2mm outward.
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