RE: Stop head banging with GCode......
Incorrect alignment or belts would make sense if it was consistent each time which, if the comments online are correct, is not really the case given the inconsistency around when and how many times it happens. As quite clearly stated in many instances sometimes it does it and sometimes it doesn't and I doubt it is the gantry or belts changing from one day or hour to the next. And many people state that they have adjusted both to no benefit. I don't doubt some people have never had the issue but there seems to be an awful lot that do and if it were gantry or belt then it is arguably a poor design or lack of clear instruction given how prevalent it appears to be. Does seem odd that it could be that, as it appears it isn't comparing two points with each other just an end stop which it hits or doesn’t. Given the short distance and alignment not changing the end-stop relative position it seems not that intuitive to suggest gantry alignment or belt tension as that would infer the point of contact positionally changes over a very short distance. Unless it strikes somewhere else first it does kind of suggest IMO that it is somehow related to software or sensitivity of the circuitry putting it on the edge of some tolerance perhaps due to temperature or start conditions.
RE: Stop head banging with GCode......
If your head bangs more than 12 times in total, (4, then 4 x2) either your gantry isn’t square or your tensions are off. It’s that simple.
I don’t think that’s excessive, and last time I set mine, must’ve been over a month ago….and that was only because I wanted to change out a tensioner housing and lubricate the tensioner screws.
Im far from a Prusa apologist, but I really don’t have a problem with this pre print calibration it does.
I'm not sure it is that simple. I had a problem with this early on that was indeed due to a gantry not being square and.or belt tension. Then just recently it came back. The only thing I changed was swapping out the aluminum heat blocks for plated copper which are much heavier. Now it is back but not all the time. Enough though that it is noticeable.
RE: Stop head banging with GCode......
The only thing I changed was swapping out the aluminum heat blocks for plated copper which are much heavier.
Whats that ?
RE: Stop head banging with GCode......
@gb160 (quote is not working for me) I am referring to this:
https://www.amazon.com/dp/B0CZDL8LTW?ref=ppx_yo2ov_dt_b_fed_asin_title
RE: Stop head banging with GCode......
@gb160 (quote is not working for me) I am referring to this:
https://www.amazon.com/dp/B0CZDL8LTW?ref=ppx_yo2ov_dt_b_fed_asin_title
Have you checked your tensions since swapping it ?
RE: Stop head banging with GCode......
Yes, I re-tensioned the belts and checked gantry play/skew.
RE: Stop head banging with GCode......
None of the "Quote" or "Edit" buttons are working... Anyway, if I replace the heat block with the stock aluminum then goes away. Maybe the extra mass of the copper heat block is causing a homing to take longer?
RE: Stop head banging with GCode......
Be careful with those solid copper heater blocks, I've stripped threads in them when applying standard torques - I have a 7mm preset torque wrench I use for nozzles and it stripped a copper block I was using in my Mk3. It clicked and kept right on turning. Was a shock, really.
RE: Stop head banging with GCode......
Thanks. I used a 2.5 NM torque wrench with a Diamondback nozzle. So far OK. I may switch back to aluminum since I (suspect) that the extra mass is interfering with homing and possibly the input shaper (which I can recalibrate but...)
RE: Stop head banging with GCode......
I received my Core One kit a few days ago, assembly was not easy as MK4, but I enjoined.
After a couple of test I was very happy with print quality, but the head banging and after reading the comments in the forum, encourage me to try something else, so:
1) First I checked & tensioned the belts as Prusa App mention: Head to the front right and 98 & 92hz, ok with that but with no less than 50 bangings or even homing failure.
2) I found some articles with the method 85hz in each lateral belt with Head back to the center. Things go better but here the banging goes between 20 and 30.
3) Looking for more, like arachnoid webplace, mentioned that Prusa App is not good depending on mobile phone, so I download spectroid and use that to listen to belt frecuencies and... adjust tensión to 98hz &92hz with head front / right and thing go worst... in 5 homing tries, 3 failures and the other with no less than 50/60 bangings, bumping, hitting, ggggrrrrrrrr.
4) I start playing dinamically with belt tensión till homing went Ok, 2 moves to the front 2 o 3 to the right, Then I checked belt tensión. head (means print head) to the center and back, lateral belts were at 89 hz.
I'm making some print test including square patterns to check printing geometry, first small printings are good.
Maybe It can help someone.
cu.
RE: Stop head banging with GCode......
I received my Core One kit a few days ago, assembly was not easy as MK4, but I enjoined.
After a couple of test I was very happy with print quality, but the head banging and after reading the comments in the forum, encourage me to try something else, so:
1) First I checked & tensioned the belts as Prusa App mention: Head to the front right and 98 & 92hz, ok with that but with no less than 50 bangings or even homing failure.
2) I found some articles with the method 85hz in each lateral belt with Head back to the center. Things go better but here the banging goes between 20 and 30.
3) Looking for more, like arachnoid webplace, mentioned that Prusa App is not good depending on mobile phone, so I download spectroid and use that to listen to belt frecuencies and... adjust tensión to 98hz &92hz with head front / right and thing go worst... in 5 homing tries, 3 failures and the other with no less than 50/60 bangings, bumping, hitting, ggggrrrrrrrr.
4) I start playing dinamically with belt tensión till homing went Ok, 2 moves to the front 2 o 3 to the right, Then I checked belt tensión. head (means print head) to the center and back, lateral belts were at 89 hz.
I'm making some print test including square patterns to check printing geometry, first small printings are good.
Maybe It can help someone.
cu.
There's probably dozens of posts in the forum about the proper way to tension the belts and what apps to use.
(I use the Gates Carbon Drive app as it works really well with my Pixel phone.)
1. Check your X/Y motor pulleys.
2. Loosen the belts
3. Square the gantry
4. Tighten the two screws equally side by side.
5. Pluck the belts across the gantry.
6. Alternate each side as you approach the right frequency. They'll interact (as Jurgen has said, the belts connect at the extruder, so tightening one screw tightens both belts.)
7. Check that the gantry is still square.
You will not be able to eliminate the banging, as that's how it measures homing. But it should bang just a few times before finishing.
Monitoring the printer with a terminal interface might give you some insight into what it's seeing and perhaps why it's not homing properly.