New user: Core One "Banging" Advice
Hello...
I am new to Prusa. I bought a Core One because I wanted a printer that would work perfect out of the box.
Apparently, that is not the case... (The printer came with a checklist of everything "OK" yet it had no firmware in it. Fixed that...)
When I start the print it does that banging in the front right corner several times. It did that during the initial pre-check too.
From what I can tell... That is a NORMAL or at least a common thing? But can be fixed with tensioning?
Other than that, I am real impressed with the prints I have gotten out of it so far. The spatula and benchy turned out great, and I am printing a Dummy 13 I am happy with so far. But I am worried about damage to the printer. I wanna fix this post haste.
Any advice is welcome. Thank you.
RE: New user: Core One "Banging" Advice
The same for me. The "banging" happens not all the time. Sometimes more, sometimes less. But it seems the printing works well. Can someone confirm this is normal? Or is this a sign the the belt tension is wrong?
RE: New user: Core One "Banging" Advice
It will bang in the front right corner a few times before each print to calibrate where the print head is. Even if everything is perfect you can expect it to bang a few times, but it shouldn't take any longer than 10 or so seconds. How long does your bang around for?
RE: New user: Core One "Banging" Advice
Is the banging being used to replace end switch sensors on the rails?
RE: New user: Core One "Banging" Advice
Its quick. Just surprising and disconcerting. Like something a limit switch would fix. But if its normal, i'll ignore it.
RE: New user: Core One "Banging" Advice
normally it should be a bump, not a bang...
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK
RE: New user: Core One "Banging" Advice
The typical cycle is something like 2 lots of 2 bangs on each rail followed by 2 round where it bounces from rail to rail. If it fails it will go for a longer cycle where it will calibrate by more banging.
It's not a replacement for the limit switch. The core one stepper drivers use tmc drivers which can detect a motor stall. It uses these rather than a switch to figure out where exactly the extruder is.
RE:
I am away from it so I cant post a video.... i will when i can, hopefully 2mrw.
I just wanna be sure its not off. I dont want to damage my machine by beating itself up.
It passed all tests and prints fine. So far. But for $1500 there should be a little more confidence.
RE:
I see this issue on my one core kit I built a couple of days ago. Sometimes the banging takes up to 2 minutes. It happens before each print and is the same when I trigger an „auto home“ from the Menu. I have read about this in some discussions here, but did not get a clear understanding yet what is going on. Have been repeating the belt tuning instructions several times without any change on this behavior.
Even though this is my first 3d printer, I do not feel this is „normal“ behavior. Looking forward to insights for this here.
Prints appear fine so far - as far as I can tell.
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.
RE: New user: Core One "Banging" Advice
I still have head banging even though my linear rail seem aligned ok, but seems to be getting worse - taking longer and longer each print.
However, after resetting the system it seems to go straight through. Not a fix, but a way to get round it for now, until Prusa [hopefully] decide to do something about it.
RE: New user: Core One "Banging" Advice
Then everything is ok with my printer - it's only "banging" a few times before every print.
RE:
Oh, I hate this. I hate this alot.
I turned on my machine this morning, expecting to show you the short banging I saw and the machine went crazy for 2 minutes! See attached.
This printer was marketed as "Out of the box OK". In my mind, this is unacceptable for such a premium price tag. I don't want to fiddle fart with it. I could have bought an ender and do that.
If this thing can't home without beating itself up, maybe SLOW IT DOWN A BIT?
I will look at the belt advice, but I really shouldn't have to do that on a brand new machine at this price point. This to me was bad design.
RE: New user: Core One "Banging" Advice
Since I can't edit (Awaiting moderation)
I am starting my second print and the home calibration went much smoother. 2 bangs x, 2 y and I believe 2 or 3 x+y.
BTW, tangent, I login to view this thread, and the second the thread opens my profile goes from showing my name to "login". I have to f5 to get my profile up. These forums are very wonky, to say the least.
RE: New user: Core One "Banging" Advice
When I first got mine (pre-assembled) it did the corner banging thing for 1 minute then I adjusted it and tuned the belts and now it does the normal 2 bangs per side. Very off-putting as there are no warnings this will happen and it sounds 'wrong'.
RE: New user: Core One "Banging" Advice
Why does it need to do any 'banging' at all? I can understand why it would want to for a full calibration, but otherwise surely it should just go to the end stops and home itself - maybe just request a 'full' calibration if needed?......
RE: New user: Core One "Banging" Advice
I think it's probably because it needs to know where the printhead is. Something other than the printer can move the head (someone can grab it and move it manually for example) so it needs to zero everything out so it knows the lay of the land.
RE:
If I take it at face value that the motor needs to stall out in order to sense it is at the end, it can be done slowly... You don't have to just hit a wall at mach 5.
Maybe then it doesn't have to repeat a dozen times, even if your belt tension is not quite perfect.
I know you all want printers to run fast but I can seriously wait 2 minutes to start my print...
RE: New user: Core One "Banging" Advice
The only reason I can see for wanting to determine the XY origin very precisely is to be able to resume a print after a power outage.
I don't care about that; out electrical grid is quite stable. I would be totally fine with a rough determination of the origin, which the Core One seems to do reliably and unspectacularly before even starting its finicky diagonal precision homing.
If the developers can't get stable, reproducible precision homing implemented, can they please make it optional via a switch in the user interface?