A cap for an Sky Watcher MN190 mak-newt. I go out at dusk to open the observatory to let the scope cool to ambient. There are air cooling holes around the lens, but if I remove the scope cover I expose the lens to possible contamination and dew. This cap just covers the lens without touching it and without blocking the cooling holes.

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Prusa

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](http://www.amazon.com/s?url=search-alias&field-keywords=Hatchbox+PETG&tag=thingiverse09-20)[ Hatchbox](https://www.amazon.com/s?k=hatchbox&linkCode=ll2&tag=thingiverse09-20&linkId=f798b0df863f056fa470f03a65697ff4&language=en_US&ref_=as_li_ss_tl) PETG How I Designed This

OpenSCAD

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