belt up/down on pulley
I am getting really frustrated cause of this belt, I have disassembled the printer, swuared it, went with fmmm mod and new gates belt.
I saw couple of old posts with people suggesting that one of the pulley is not straight but how do I find out which one?
Anyone able to help me?
Thanks!
45 Replies
wee-brownOP•2y ago
moving the x in the right side makes the belt to go down, move x axis left side belt goes up
Check if you have the correct order of shim and stuff on the front idlers
wee-brownOP•2y ago
@bulmaster indeed I checked the idler and the pulley before the motor and reshimed both to be 14mm from the bottom plate, reshimed motor puley(-1mm) and it is all good.it has just a tiny bit of play but it is acceptable
I will deal with the right one later today
genetic-orange•2y ago
In the video, the front bearing pack is higher than the rest.
wee-brownOP•2y ago
yes, I noticed after I posted the clip. It was shimmed wrong
wait a second.... took a snapshot of your vid! look at the two arrows!
The only way the belt will walk up down like that is if the 'guides' feeding the belt direct it there
In this pic...that back pulley is LOWER than the front! that matches whic hway it's walking!
Is that a spacer underneath the pulley?
wee-brownOP•2y ago
yeah I don't know what I was thinking when I have done it :))
now it is fine
I like your plate setup much better than the printed cage that leaves no way to check on the rear idler! Where did you get this from?
Printables.com
V-Core 3 motor mounts (aka FMMM) by RaYa | Download free STL model ...
Full Metal Motor Mount (FMMM) replace printed motor cage parts by metal plate | Download free 3D printable STL models
wee-brownOP•2y ago
it is the fmmm motor mod, is way better as you can see the belt and route the belt even with the mounts attached
I got it from aliexpress, it is the same as base plate, you need 2xidler plates, 2x motor plates extra plus the bolts because the standard bolt that holds the bearings it is too short
check the link above
Thanks! I will install this
Just don’t install random spacers where there shouldn’t be any 😁
wee-brownOP•2y ago
😂had some extra, I put them there so I am not loosing them
wee-brownOP•2y ago
wee-brownOP•2y ago
I feel like I am going crazy with this printer, I know it is my fault but it is way too tricky to get it printing..
@ptegler @bulmaster Could you please please help me sort this one too?
the next pulley(top right corner) is not fluctuating at all...
Could be the upper belt is to tight. Did you check the tension?
wee-brownOP•2y ago
yes, they are both at 70hz, checked with the belt tension macro and with a phone app while gantry at the back
at this point I don't know what else to check
Use the adxl and the ratos macros to measure the belt tension
wee-brownOP•2y ago
wee-brownOP•2y ago
I lowered the belt tension, the graphs still look good enough..
can it be a dodgy adxl? because I use the on on the toolboard ( ebb36)
fullscreen,,,, then magnifying the screen a bit...it really looks like that top bearing is smaller in diameter than the middle and bottom bearing in that stack. ??? That would make it walk
wee-brownOP•2y ago
I will check out, indeed I have bearings from two different suppliers
thanks !!
@ptegler they are both the same, same diameter, flange, outer and inner diameter.
Measured all dimensions.
I will replace the bolt holding the assembly maybe I see an improvement
one thing I have notice though is that a inner flange of a bearing is a a bit out
So I have replaced all three bearings shims and bolt, no change, the belt is still doing it.
What ai notice that the same belt on the oposite side is doing the same
wee-brownOP•2y ago
wee-brownOP•2y ago
the motors side of belt is fine
anyone? 😫
please
the only logic for any belt to walk up/dn on a pulley is the either the angle of the pulley pivot axis is not perfectly perpendicular to the belt, or the next traverse point of the belt travel is not parallel and in the same plane as that pulley. EG: it you feed the belt off angle to the pulley it will walk in that direction.
wee-brownOP•2y ago
thanks @ptegler !
Does it only happen on the printer parts?
Also only thr upper belt right?
Also I see your switched to elcos mod, are you sure the parts are printed correctly? Did this happen after you went without a gantry?
Last but not least by a long shot, are the belts damaged? Are they good quality? If they are not proper width all the way they will ride.
Sorry for slow replies very busy at work
Mark the part of the belt where it jumps and try to check if thr same part of the belt rides up/down. You can just move the tool head on the X axis for that
wee-brownOP•2y ago
Thanks @bulmaster ,
It happends only at upper belt right
I had problems with belt being damaged at the motor mounts so I went fmmm mod and thought about extrusionless, the belt was fine before(old one) at that side but bad at the motor mounts side.
I also rebuilt the whole printer, less than 1mm on diagonals ( think @ptegler helped me at that point)
I printed them in abs with good tolerances and 60-70%infill (forgot the number)
the belts are gates belts bought from a uk website (around 60 quid for 4.4 meters) now they are a bit damaged but they never went through a print, only bed meshes and movements to try and fix the path
I will swap the belts between them to see if there is any difference.
Thanks a lot for the reply !!
wee-brownOP•2y ago
Didn't had time to swap the belts but thought to post the motor sides just maybe someone sees something that I won't.
genetic-orange•2y ago
Can it be that the pully in the right vid is wobbling? It also looks like the belt is too tight there, but that can also be deceptive.
In the still image it already looks as if it is crooked
wee-brownOP•2y ago
the pulley is a bit wobbly but just a tiny bit and I can't really connect this with the walking belt as long as the belt don't walk on the wobbly pulley I doubt it will on the next pulley
nope, it is the picture
the belt was fine in the clip, done a belt measure in ratos and also used my phone to double check
genetic-orange•2y ago
I think you put it together wrong if it's the DJ Design Mod, there's only one aluminium part under the Puli and not two. https://www.printables.com/de/model/299097-motor-decouple-damper
Printables.com
Motor Decouple-Damper von DJ_Designs | Kostenloses STL-Modell herun...
Made this to upgrade the Ratrig V-Core 3.
make it more smooth and silent.
it can be used for other printers as well :-) | Kostenlose 3D-druckbare STL-Modelle herunterladen
wee-brownOP•2y ago
it might be because I printed the wrong file for L motor. But all the pulleys are lining up on the motor sides
and I don't know if I have 6mm spacers, it might be 2x3mm
I have returned to old 2020extrusion for x and xy joiner and the belt is still going up and down at the same place, next days I will swap the belts to see how it behaves
@ptegler @bulmaster know I bother you with this but maybe you have a moment for a hint,
At the moment I went back to 2020 extrusion so regular x rail, and replaced the belt with another one.
The belt goes up and down in the same spot..
the previous idler (top roght corner) it is leaned towards the c carriage or towards the back of the printer ?
If I move hotend to left side belt goes up, if I move it to the right it goes down
can't wrap my head around it..
Hey sorry kids sick and all.
What do you mean leaned? It should be straight, as in perpendicular to the base it stands on
wee-brownOP•2y ago
oh, sorry to bother...
it is not something I can tell, I asked in the belt run I have(x left belt up, x right belt down), theoretically what way that pulley would be leaned?
cause I tried to move the top motor plate more towards the front on towards the back and there is no change
even with the plate off, if I lean the pulley the belt walks the same
I feel bad that I wanted so much this f*** printer and I can't make it run as it should. Have an ender 5 printing all day without problems, I just want to throw the ender on the window just to stop watching it printing :)))
It shouldn’t lean at all. Everything should be perpendicular to the base. Again sorry for slow replies
wee-brownOP•2y ago
yes, I know that. But in my case, in which side you think it is leaning so is resulting in this up and down walk?
I understand now. Not sure it’s leaning, as it’s going up and down while you move in one direction. If it was leaning it will move only up or down as you move in one direction and go the other way as you move in the opposite direction
Unless I missed something in your videos. If it’s only moving up or down as you move the head then the place where you see the movement is the leaning one
wee-brownOP•2y ago
it is moving up if I move left and down if I move it right
Well check that one for straightness
did you solve it ? if so how. I feel like the vcore 500 is a DOA machine for everyone minus the top 10 elite
wee-brownOP•14mo ago
no, bought another vcore400, assembled it, same problem. I will replace the belt and sell both. Good luck with yours
I'm swapping the bearings with 10mm pulleys
10mm bwlts
They're cheaper