RE:
I just got my COREOne Kit built. I had the 1-2 minutes of head banging BECAUSE IF HAD FORGOTTEN TO TENSION THE BELTS.
If you LOOK at the menu while the banging is going on, you will see that the ZEROING step is failing to ZERO ! So the printer keeps repeating the 2 taps on X and 2 taps on Y to try to get a successful home.
The troubleshooting instructions state that ONE of the causes of this problem is that the belts are too loose.
I suppose what is happening is that the belts are so loose that the motors do not stall out, the belts just slip.
From multiple threads on this topic, it seems that the more common cause is not the belts being loose, but the X gantry not being orthogonal to the Y axis. The bump against the front end-stops then becomes a double-bump (left & right end stop at slightly different times), and apparently the firmware cannot derive a precise reference position from that.
The observed behavior is also different in this case from what you describe: It's the diagonal bumps which get repeated endlessly, not the right, right; front, front double-bumps.
Edit: Prusa's new guide on belt tuning explains how to obtain an alignment which avoids this problem.
RE: New user: Core One "Banging" Advice
Prusa has failed miserably to explain and resolve the head banging issue. Prusa considers 8-10 head bangs normal. Firmware 6.4.0 reduced the print head velocity during authoring so the head banging is now not as loud. If you have more than 10 head bangs either your belts are too loose, your gantry is not flush with the the stops on each side, or one belt is looser than the other.
It would be nice if Prusa had come out and just stated these facts in the manual rather than everyone trying to figure this stuff out by trial, error, hair-pulling, and teeth-gnashing.
RE: New user: Core One "Banging" Advice
I managed to completely get rid of the noisy operation, constant and tiring adjustment of linear belts, clattering print head, and even got rid of constant leaks from the nozzle onto the table. I no longer have to pull out pieces of filament every few minutes. It didn't take me much time. Although I was a little apprehensive, switching to a mature competitor's product turned out to be a bull's-eye. Now it just prints without spending time on constant repairs.
RE: New user: Core One "Banging" Advice
I managed to completely get rid of the noisy operation, constant and tiring adjustment of linear belts, clattering print head, and even got rid of constant leaks from the nozzle onto the table. I no longer have to pull out pieces of filament every few minutes. It didn't take me much time. Although I was a little apprehensive, switching to a mature competitor's product turned out to be a bull's-eye. Now it just prints without spending time on constant repairs.
That's one way to approach it. My Core One (built from a kit) does not have any of the issues you mention though, so it's not the only way.