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.
RE: New user: Core One "Banging" Advice
If you are getting a lot of banging and homing...are you using the Prusa Research configurations in slicer? That cured a lot of my problems. I get maybe two homing bangs and that is it now. Quieter also.
Extra HAM Radio - N4MCC
RE: New user: Core One "Banging" Advice
Are you using the Prusa Research configurations in the slicing wizard? That helped me a lot.
Extra HAM Radio - N4MCC
RE: New user: Core One "Banging" Advice
I'm pretty sure I am.
RE:
So last night, I tried to run some prints.
Granted it was 40F or so in my garage. But the printer went bonkers trying to home. By that time, I had the filament in the machine. (I have a little space heater I have been using to warm up the area and print)
I see no justification for having to home to unload the filament... I mean, why? Why does the printer care where home is to purge it? If your intent is to reload or change color, then home. If I want to just take filament out, I could care less where the head is...
If it cannot home, it cannot unload (using the unload function). That is dumb.
It's working now, I just wish the machine didn't have these little oddities...
RE: New user: Core One "Banging" Advice
Check If your x-axis is straight:
1 disable Motors
2 loosen the belts
3 pull the x Axis to the Front
4 If it touches left and right at the Same time you are good and can retune you belts to 85 Hz (but still Check both belts, as they are affect each other)
5 If Not you can bend the Axis straight.
6 with loosend belts Put a Metal tool between the x Axis and the Front. On the other Side that is already touching the Front, and then use some force to bend it Watch this video
7 If it is touching on one Side Just barely you can retighten your belts. Or rebend it a few Times gently into shape.
8 still failing? Check the Motors in the Back. Mifht want to use a flashlight and light into the Motor holder cutouts, the belts shloud be on the teeth.
There's no better way to describe it.
The belt tension needs to be adjusted properly, and then the “banging” will also be reduced.
I agree with you, it's not a nice solution. Small consolation: the Bambu Lab X1C does the same thing—not for as long, but it also needs to know where the “end” is.
Other systems such as hall sensors or light barriers would also work, but that's a question of cost and a question of programming + fail-safe features.The motors have a power consumption and that's what sets the end.
RE: New user: Core One "Banging" Advice
I see no justification for having to home to unload the filament... I mean, why? Why does the printer care where home is to purge it? If your intent is to reload or change color, then home. If I want to just take filament out, I could care less where the head is...
I think the intent is to move the print head to a defined XY position, namely one where the Bowden tube (PTFE tube) has a large bend radius, to make it easier to load/unload the filament.
RE: New user: Core One "Banging" Advice
I see no justification for having to home to unload the filament... I mean, why? Why does the printer care where home is to purge it? If your intent is to reload or change color, then home. If I want to just take filament out, I could care less where the head is...
I think the intent is to move the print head to a defined XY position, namely one where the Bowden tube (PTFE tube) has a large bend radius, to make it easier to load/unload the filament.
Once the material is freed from the print head, I can yank the material out pretty easily. I don't think the bowden tube would be able to stop me. Loading I understand. Unloading I just don't.