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X Axis Belt and Tension  

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bambi
(@bambi)
New Member
X Axis Belt and Tension
Hi! I have a Prusa i3mk3 and would appreciate some help troubleshooting a problem.
I started noticing some layer shift and thought maybe it had to do with the x-axis belt. I checked my belt tension, which was about 200. Not realizing that is too tight (not too loose) I trimmed the belt and tightened the screw on the top of the motor holder and cracked the piece!
Replaced that with a spare and realized my mistake. Ran a Self Test and passed but the extruder doesn't move very smoothly across the x-axis.
Most perplexing, now my belt tension number still seems to be reading ~220 but the belt feels too loose. 
 
Did I just overtighten and stretch the belt? I have a spare belt I can use to replace it. Any suggestions are welcome!

Best Answer by Diem:

Have you damaged the X-idler bearing housing?

Cheerio,

Posted : 08/03/2021 9:57 pm
bambi
(@bambi)
New Member
Topic starter answered:
RE: X Axis Belt and Tension

It seems passing the Self Test was a fluke. I'm failing the Belt Test, with an x length error.

Posted : 09/03/2021 12:44 am
Diem
 Diem
(@diem)
Noble Member
RE: X Axis Belt and Tension

Have you damaged the X-idler bearing housing?

Cheerio,

Posted : 09/03/2021 5:41 am
bigtodski
(@bigtodski)
New Member
RE: X Axis Belt and Tension

if you can print one of these https://www.prusaprinters.org/prints/46639-tension-meter-for-the-gt2-belts-of-i3-mk3s-or-prus

i had a problem with belt to slack and number was 246 but was getting layer shifts on the x axis , used this and it sorted the problem, in my post a couple down dan said just to ignore the numbers 

i adjusted the  belt to just under the max marker then ran the self test and it past 

Posted : 09/03/2021 10:44 pm
Oleg
 Oleg
(@oleg)
Active Member
RE: X Axis Belt and Tension

Does anyone know how to obtain g-codes or even stl files for the tension meter, that could be used with PLA or ABS? I don't have Prusa PETG filament, but I'd like to print the tension meter...

Thank you!

Posted : 10/03/2021 1:23 am
Clarmrrsn
(@clarmrrsn)
Honorable Member
RE: X Axis Belt and Tension

Not sure, Prusa specify PETG for this as that what is was calibrated with.

You could try someone near you and see if they would print you one.

https://www.prusaprinters.org/world

 

 

Tank you very much!...
Posted : 10/03/2021 2:03 am
Oleg
 Oleg
(@oleg)
Active Member
RE: X Axis Belt and Tension

@clarmrrsn

Thank you for your response!

Posted : 10/03/2021 2:37 am
Dan Rogers
(@dan-rogers)
Noble Member
RE: X Axis Belt and Tension

@oleg

Any PETG will do.

Posted : 10/03/2021 3:42 pm
Jay
 Jay
(@jay)
New Member
RE: X Axis Belt and Tension

@bambi

My, newly assembled i3 did fail to on the X-axis. The reason was that the nylon cable cover from the extruder was too tight around the wires. This made the cable too stiff and too short. So the x-axis could not reach the right side of the bed fully and returned an error.

I did loosen the cover, made the cable longer by unwinding it. This solved the x-axis problem 

Posted : 11/03/2021 10:42 pm
bambi
(@bambi)
New Member
Topic starter answered:
RE: X Axis Belt and Tension

@diem

It seems the bearing position somehow got shifted some when I was messing with the belts. It was affecting the plate and cable placement which might have been causing the x-length problem. I've moved it back into the correct position and replaced the belt for good measure. It seems to be working fine now.

Posted : 11/03/2021 11:03 pm
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