RE: HOMING ISSUES
IT'S OVER, thanks or no thanks. Choose either one.
RE:
Either you are trolling us or you are not able to follow the instructions given to you by Prusa or by us for whatever reason.
- Philips screws
- The profile shapes
- Routing the belt around the gantry pulley
- Inserting the belts into the linear rail harness
None of these are unclear to the people who have built the printer in that I haven't seen on these forums or in the comments section of the build guide a similar misunderstanding as yours. As Jürgen is pointing out, we are trying our best to help but it almost comes across as you don't want to (or can't) be helped.
I am willing to do the following. I will take apart my printer and from the same state as your, create a video on how to reassemble from that point. Would you like that? Would that help you?
RE: HOMING ISSUES
I have the belt connected, if it stays is a whole other question. You can't justify everything as trolling, it's a common phrase used online for when one doesn't go along with the crowd or agree; there is something wrong with them.
Besides a few faulty or missing parts the assembly wasn't difficult, I expected the belt to give a little frustrations but not to this length. The only thing which can be done is, since I have the belt in the harness and the tension seems alright for both axis, is to connect the nextruder and hope no more HOMING errors.
RE:
And so since I'm such a huge troll.
https://ln5.sync.com/dl/c36306040#zfcr45dg-6mek8icv-ir5mw3hg-jsze37km
RE: HOMING ISSUES
OK, please just do one thing. Start the assembly process. Just before you attach the Nextruder, can you take a photo of the belt harness? We've asked this many times. Can you at least do this one ask? Otherwise, perhaps it's best to contact support and work with them.
It's more than you are "no going along with the crowd" it comes across as you are willingly ignoring our advice which is frustrating.
RE: HOMING ISSUES
Is this not what you want to see; https://forum.prusa3d.com/forum/postid/772577/
OK, please just do one thing. Start the assembly process. Just before you attach the Nextruder, can you take a photo of the belt harness? We've asked this many times. Can you at least do this one ask? Otherwise, perhaps it's best to contact support and work with them.
It's more than you are "no going along with the crowd" it comes across as you are willingly ignoring our advice which is frustrating.
RE: HOMING ISSUES
OK, @Butters if you had just taken this photo from the beginning it would have cleared up a lot of confusion. We asked many times for this. OK, now with the belts in this position, it still slips out of the harness? Also, can you unscrew the harness from the linear rail and take a photo of the back part?
RE: HOMING ISSUES
Your asking to take apart something that may work. Lets put this one on pause I'm willing to disconnect the nextruder one more time if needed; lets see if how I did the belts works this time.
If it fails, after two calibration tests and a print; then I will reply with the picture you requested.
OK, @Butters if you had just taken this photo from the beginning it would have cleared up a lot of confusion. We asked many times for this. OK, now with the belts in this position, it still slips out of the harness? Also, can you unscrew the harness from the linear rail and take a photo of the back part?
RE: HOMING ISSUES
Your asking to take apart something that may work. Lets put this one on pause I'm willing to disconnect the nextruder one more time if needed; lets see if how I did the belts works this time.
If it fails, after two calibration tests and a print; then I will reply with the picture you requested.
OK, @Butters if you had just taken this photo from the beginning it would have cleared up a lot of confusion. We asked many times for this. OK, now with the belts in this position, it still slips out of the harness? Also, can you unscrew the harness from the linear rail and take a photo of the back part?
It's not a big ask just remove the screws, flip the part around with the belts in place and take a photos. But if you feel confident that the belts are in the right position and will not slip, then reassemble and see if you pass the calibration tests.
RE:
The calibration checks off it passes HOMING but yet it fails HOMING. When I try to print it says "crash detected".
Why when doing the Y-calibration does the nextruder take what is a perfectly good high frequency belt and just gnaw it apart so it's extremely low frequency.
Everything else, passes calibration with ease.
RE: HOMING ISSUES
The calibration checks off it passes HOMING but yet it fails HOMING. When I try to print it says "crash detected".
Why when doing the Y-calibration does the nextruder take what is a perfectly good high frequency belt and just gnaw it apart so it's extremely low frequency.
Everything else, passes calibration with ease.
I'm not following. So X, Y and Z calibration are passing. Homing calibration is passing. When you try to print something you get a crash detected? This can be caused by a severely bent gantry due to improperly tightening the belts. Or it could be a load cell issue. I'm going to guess you tightened the belts asymmetrically.
So let's start with the belts. You are staying the belt tension is correct (both belts are in the 90-100hz range). However after you rerun Y-Calibration, one of the belts is now loose? Please explain, step-by-step how you are tightening the belts.
RE:
What exacting is meant by HOMING ?
I'm tightening, one belt at a time; as it's difficult to do both at the same time; it's possible but difficult to get it perfect.
The calibration checks off that Y passes the test, but HOMING always fails. And printing fails as well with HOMING error. The belt has come completely off for the Y axis so removing the harness is needed again.
I'm really starting to believe the gantry is the problem, as I mentioned there is a 8.74mm gap on the right side when squared. And I can't get that to square up, I've tried bending but nothing works, I think by forcing the belt to square it up; it's frequency becomes extremely low (loose) when doing calibration.
RE: HOMING ISSUES
The X-axis belt remains good, the Y-belt is the troubled belt. The frequency for the X-axis is good.
RE: HOMING ISSUES
What exacting is meant by HOMING ?
I'm tightening, one belt at a time; as it's difficult to do both at the same time; it's possible but difficult to get it perfect.
The calibration checks off that Y passes the test, but HOMING always fails. And printing fails as well with HOMING error.
Homing calibration is where the print head moves to the front right position and bangs against stops the many times. Multiple issues can cause this to fail. The first that comes to mind is your gantry is severely bent because you improperly tensioned the belts. If I understand what you wrote, first you are turning one screw until the belt gets tight, then you are turning the other screw. If you do it that way, then you will bend the gantry and homing will fail. First you must loosen the belts and check that the gantry is straight. If it isn't then you need to bend it by hand. Next both screws must be turned the same amount. It doesn't have to be at the same time. Just turn the left screw, then right screw by the exact same amount.
Please follow this guide: Adjusting belt tension
Quick gantry alignment
If there is a gap in either side of the gantry, you can try to force it in the opposite direction manually:
1. Fully loosen both tensioner bolts; this will allow free gantry movement.2. Move the gantry halfway back along the rails.3. Grip the gantry firmly on both ends and apply a gentle counter-force in the opposite direction of the tilt until it straightens.4. Check the alignment with the belts still loose, and carefully push the gantry forward. Since the loose belts will not pull it all the way, you may need to guide it by hand. Verify that there is no gap on either side at the front position.5. Tighten both tensioner bolts gradually, alternating between them, tightening each by the same amount to keep the gantry straight. You may hold the gantry in place with your hand while tightening. After tightening both belts, make sure no gap has reappeared.
Note: Apply force carefully to avoid damaging belts or bearings.
RE: HOMING ISSUES
The X-axis belt remains good, the Y-belt is the troubled belt. The frequency for the X-axis is good.
I very much suspect you are not tightening the belts correctly.
RE: HOMING ISSUES
When doing the Y-calibration, should the belts tension be halfway, then after calibration, tighten the belts. This why the belt gnawing during Y-calibration can be fixed.
RE: HOMING ISSUES
Oh my God, what are you babbling about again? Can you even understand the content of the written text? This is not a printer with Cartesian coordinates, where the X and Y axes were independent of each other and were also adjusted independently. Here, both motors have to work together and both belts are adjusted together and unfortunately they also keep the portal in a perpendicular position here. However, the portal has to be perpendicular before you start tightening the belts and not that you will have a gap of 8.75 mm on one side as you write and you are trying to fix it by tensioning the belts! Do you have the pulleys on the motors correctly mounted and the blocks with pulleys correctly mounted and not reversed? Follow the instructions for tightening the belts above exactly. And if you don't understand what's written there, get an interpreter to translate the text for you into a form that you can understand and accept!
RE:
When doing the Y-calibration, should the belts tension be halfway, then after calibration, tighten the belts. This why the belt gnawing during Y-calibration can be fixed.
No @butters. The belts have to be fully tensioned before running calibration. What I think you are doing is over-tensioning one side only, the belt tensioned are not correct and you are bending the gantry. The gantry must always be parallel to the frame. Since you have a 8.7mm gap, you are doing it wrong. Also, to follow-up with what @miroslav is saying. Check the X and Y motor pulleys. Did you install then the correct way?
Please read this carefully:
- Completely loosen the belts
- Check if the gantry is square with the front frame. If it isn't, bend it by hand until it is but don't bend too much
- Tighten the belts starting with left screw 1 turn, right screw 1 turn, left 1 turn, right 1 turn.
- When the belts start to get tight then do, left screw 1/4 turn, right screw 1/4 turn.
- Measure the belt frequencies. Make any adjustments 1/8 turn only and both screws. So if too tight, loosen 1/8 turn left, 1/8 turn right
You must always tighten the left and right tension screws by the same amount and in the same direction.
RE:
I'll add one more thing that @miroslav mentioned. CoreXY printers work differently. The 2 belts are not X and Y belts, it's better to call them 'A' and 'B' belts. So when the print head moves in the X direction only, both A and B move together in the same direction. If the print head moves in the Y direction only, then A and B move in opposite directions. When the print head moves in a diagonal, example from front left to back right, then only belt A moves. When moving from back left to front right then only belt B moves.
So when you are doing Y Calibration, both belts are moving in opposite direction to each other. Y Calibration is not dependent on one belt, it's dependent on both belts.
This is why it's important to tension both belt screws equally.
RE: HOMING ISSUES
Just because I'm not speaking in the language you would like to understand, whatever language that is; look if you want to take it to a fight, as you are leading too that can be done. Don't make assumptions as you are doing.
Oh my God, what are you babbling about again? Can you even understand the content of the written text? This is not a printer with Cartesian coordinates, where the X and Y axes were independent of each other and were also adjusted independently. Here, both motors have to work together and both belts are adjusted together and unfortunately they also keep the portal in a perpendicular position here. However, the portal has to be perpendicular before you start tightening the belts and not that you will have a gap of 8.75 mm on one side as you write and you are trying to fix it by tensioning the belts! Do you have the pulleys on the motors correctly mounted and the blocks with pulleys correctly mounted and not reversed? Follow the instructions for tightening the belts above exactly. And if you don't understand what's written there, get an interpreter to translate the text for you into a form that you can understand and accept!