Belts ride up and down on my Idler

[the23rdwarrior]

Printer Model

Voron Trident 250 LDO Rev D

Extruder Type

Galileo

Cooling Type

Stealthburner

My belts ride up and down on my B Idler on the x y joints. I checked belt tentioning carefully with the GT2 Meter to 2.5lb. I played around (tighten more up or down) with my BFI Front Idler but notthing seams to change anything....

 

[claudermilk]

Something isn't vertically square. On mine I ran into that after switching to the Ramalama pin front idlers. Once I got those adjusted correctly the belts ran correclty.

 

[the23rdwarrior]

I also have the BFI front idler pin modded. By 'adjusted correctly' you mean tentioning the upper or lower screw until it works?

 

[claudermilk]

OK, that's likely your issue. Yes, by that I mean tension the screws evenly. Now my method is to tighten the screws until they are just touching the printed part, so no tension yet and all screws are at the same point. Then I give each screw a turn or two until the belts get a little bit of tension and start tightening by one turn then half a turn--always the same amount on each screw. It's longer & a little tedious, but my belts run perfectly centered now.

So, I suggest you loosen the adjusters and try that method to re-tension the belts.

 

[the23rdwarrior]

I competly redone my belting and followed your instructions but couldn't solve the issue. But i noticed that the B Front Idler is looking like it is aligned too low in relation to the XY Joint idler.
I will try to switch the Front Idlers to Check if the Problem then occurs on the other side or if the X Y Joint is the Problem. Is there a chance to build the X Y Joint incorrectly that is it scewed up? The Part doesn't seem to be warped...

 

[claudermilk]

It's possible but less likely. All the gears & idlers have to be aligned, are the gears on the AB motors lined up correctly? The front idlers, especially the pin mod ones are the most obvious & easiest to adjust.

 

[the23rdwarrior]

I switched the A / B Front Idlers around and dit a lot of tinkering but couldn not really improve this. Sometimes i got a good results when the gantry was in the front but as soon as i move the gantry to the back, the problem reappeared.

I will try to print the default BFI Front Idler (I now have the symetrical) with Pin / Screw variant and do some more testing.

just to clarify, i not chasing unicorns, am i? I mean is no up and down movement the norm. Is it ok as long it isn't touching the walls of the idler. Is a littlebit touching ok?

 

[claudermilk]

No up and down movement is the norm. Mine don't move vertically at all. Spec belt path except for the pin front idlers, and those were carefully tightened with the method I described above. So if the belts are moving vertically that tells me something is out of alignment.