YOU CANNOT DO THIS IF YOU DO NOT HAVE A HEAT SOCK ON YOUR HOTEND. TRY THIS AT YOUR OWN RISK!
Here's a video of it in action: https://www.reddit.com/r/ender3/comments/nrkwim/finally_got_an_endoscope_working/
I ended up using this Endoscope: https://www.amazon.com/gp/product/B071HYRPND/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1 And a Blips macro lens: https://www.amazon.com/gp/product/B08MFSDZB8/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1 to focus the camera
If you do end up making this, you should know -The hole on the mount is a little small, so a Dremel is a good tool to have at hand
-My Z offset is different than yours. If you end up using the focusing cap, you may have to sand the undermost part parallel to the bed down a bit to stop it from dragging on the bed
-Some blue tape or Kapton tape can be used if you overshoot tolerances, it can help things fit snuggly
-This attaches to Scott Yu-Jan's version of the Satsana fan duct
Also side note: Thingiverse won't let me mark this as a remix, but it is one of this fan cover here: https://www.thingiverse.com/thing:4794742