You've got my approval to post more 3D printing related stuff (Klipper, Moonraker). Your opinion would add a lot of value with the Linux knowledge you have. Maybe even create your own plugin?
Which of the old i3 clone kits was it built from? I have 70% of a Mendel 90 that I want to upgrade and Klipperise, just so it doesent feel left out LOL!
Those aren't 150mm/s! You need to have an Acceleration of roughly 3800-4500mm2/s to make use of real 150mm/s. With an Acceleration of 4000mm2/s you need to travel 3mm with the Nozzle to reach 150mm/s. The Acceleration shown in the Video are not even 2000mm2/s. The modest way to tune your Acceleration is to get yourself an ADXL345 and messure which Frequenzy the Inpushaper should handle the Vibrations. Don't care about the max Accel shown in the Graph that much, you probaly need to go lower with your i3.
I think that you can do alot more, that hotend extruder combo should be replaced, tha part that you changed dont do nathing to the partial clog that you had in the cube that was pure luck !
Buy an Orange Pi, loads of the little suckers are available, I have an Orange Pi Zero 2 running Octoprint, there is a little more to install but plenty of tutorials out there
As for RPi availability.. the supply-chain issues is getting far better, RPi’s are appearing for sale; on Amazon I’ve seen 8gb models at $90 shipped, that’s only $15 over their “real” price of $75. A FAR cry from the $395 I saw a during ‘The Dark Times’. I really like the community built around the RPi, especially the software support… I find it far better than another other fruit community.
