If you want to pull the gear off the end of the stepper you have there's gear pullers you can print that will do the job, other wise just match the size mean 17 40mm. Just make sure to check the point on the motor when you get it to make sure it matches what creality has going on.
I own an iPad and wanted to copy a gig worth of shit onto it, I think I ended having to resort to Google drive but I still have no clue how to get files onto that damn thing. I'm not sure why apple needs to lock down file transfers on iOS so hard.
Oh I know this one, the Apollo 11 cameras were 320 scan lines at 10fps with an optional high res setting of like 1280 scan lines at 0.625 fps. Not sure on the second setting but the first one I'm positive about.
Just be real careful with the chromebox, an lot of them can't run Linux and are pretty low specs so I wouldn't want try putting everything I want to run on them. The CPU in HP gen 2 one I have is just a dual core without hyper threading. I would only even look into the a Chromebox if your thinking about Plex pass and hardware transcoding.
Also should be noted anything bought used your not paying for a Windows license though most the SFF boxes come with windows license baked into the bios.
If you have Plex pass the key for 4k streaming is hardware transcoding. Quick sync with any newer Intel CPU, like 8th Gen and up, is going to hardware transcode 4k fine. Personally I bought an HP chromebox gen 2 and threw Linux on it to run Plex then have VMs and what not on separate small form factor boxes.
I'd bet you could probably run all the services you're mentioning on something like a single USFF Optiplex but if you want to throw drives into it for storage then the towers would be the way to go.
It's definitely possibly but there'd have to be some interesting happens with the rest of the field. 2010 is the closest I can find to it being possible but even that year our non podium finisher would have needed more help from the racing gods.
I'm like 100% sure that's a PID tune.