@dcbarry

Checked and replied, hope it helps.

Have you checked your "Cooling" section on the speed tab? Just did a test slice of a 30x30x30 cube and it's slower than "ordered". I'm attributing this to the minimum layer time and minimum print speed.

-Real time while typing test:

Changed the minimum layer time to 1 sec for the same model with the same slice settings except as indicated and all speeds are as "ordered".

MC is trying to give you printer adequate cooling time, just change the minimum layer time and speed and you should be good to go. Hope this helps.

Under the Printer Tab, General Sub-tab; that is where you can adjust the baud rate.

What Filament are you using? I started having symptoms similar to yours when there was about 1 year of use on my ruby nozzle, but you've swapped that already. I had similar issues as well when trying to use a "translucent" PLA, just wouldn't print for the life of me; and Prusament PLA (but it prints flawlessly on my MK3s...go figure).

Check in MC what your nozzle size is set to and verify the size nozzle installed. I know these seem like trivial things, but just some steps to try.

Have you contacted MH support?

I like MC for the mesh modifications; that are easily done inside it, but for any sequential printing or complex slicing, I use Prusa Slicer or Cura.

I would try and find a "preset" for your printer for either of the two mentioned programs.

Does your printer use bed leveling through MC?

The best advice would be to invest in a professional commercial machine that will cost probably 100x what you bought your mega x for.
Even with some filaments like the BASF 316L, that MH sells, your machine doesn't exactly meet the heatbed requirements. Link to the MH page with said filament:
https://www.matterhackers.com/store/l/basf-ultrafuse-316l-metal-composite-3d-printing-filament-175mm/sk/MRDKJRRS

Sorry to be curt, but there is no simple and straight forward path that takes you from hobby machine to industrial machine. Good luck.

You can run the gcode Cura gives you through MC for the leveling if that's what you need; but other than possible leveling, why are you using MC?

I got a warranty replacement BL touch that was incorrectly wired. Just a heads up. The attached picture was the correct "pin-out" in relation to the board.

It's going to be difficult because the filament is possibly expanding the tube slightly, helping to retain the tubing in the collet. In situations like this, I've gently but forcefully pulled the tube out while supporting the extruder.

Remove all tension off of the extruder gears before attempting this. You might be able to push another piece of filament through the extruder input or the other end of the tube and dislodge the stuck filament.

You could have received a possible defective nozzle with a broken ruby. I ran PLA and PETG for a long time before i did abrasive filaments and even after NylonX, Nylon G and Glow PLA, never had any quality issues.

If you would like better help, we need pictures of the prints and the associated data on them; temps, speeds, and such.