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mk4S X-Axis Pully bearing  

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Armand
(@armand)
Trusted Member
mk4S X-Axis Pully bearing

Hi;

Does any one perhaps have the following measurements for the  mk4S X Axis Pully bearing:
Supporting Belt Width:
Flange diameter:
Diameter where belt runs:
Bore: 

https://www.prusa3d.com/product/pulley-with-bearing/

I 'm trying to source one locally in my Country as to order just this part from Prusa would be over kill
Thanks in Advance

Best Answer by jan.d.slay:

Does any one perhaps have the following measurements for the  mk4S X Axis Pully bearing

Measuring would be much faster.
But well... does that help you?

https://www.printables.com/model/1136281-prusa-xl-modified-left-and-right-y-carriage-for-to

Respondido : 21/01/2026 7:52 am
1 les gusta
miroslav.h4
(@miroslav-h4)
Prominent Member
RE: mk4S X-Axis Pully bearing

And you don't have an old pulley and a caliper? But that would mean some work and so you better ask others, right? Otherwise, the most common pulley is available in any store with parts for 3D printers.

Respondido : 21/01/2026 9:30 am
1 les gusta
jan.d.slay
(@jan-d-slay)
Estimable Member
RE:

Does any one perhaps have the following measurements for the  mk4S X Axis Pully bearing

Measuring would be much faster.
But well... does that help you?

https://www.printables.com/model/1136281-prusa-xl-modified-left-and-right-y-carriage-for-to

Prusa Core One - Fast & Clean Start Gcode
Prusa XL - Quick Start Gcode
Respondido : 21/01/2026 11:25 am
Armand
(@armand)
Trusted Member
Topic starter answered:
RE: mk4S X-Axis Pully bearing

Yep you are absolutely correct,  I can measure it , and would be probably faster , its just I have some prints running at this stage and wanted to get a spare so long , but will strip the X axis ones the prints are done. Just funny that Prusa support does not even know what the measurements are, hence why I just popped the question here

Respondido : 21/01/2026 12:30 pm
1 les gusta
Armand
(@armand)
Trusted Member
Topic starter answered:
RE: mk4S X-Axis Pully bearing

 

Posted by: @jan-d-slay

Does any one perhaps have the following measurements for the  mk4S X Axis Pully bearing

Measuring would be much faster.
But well... does that help you?

https://www.printables.com/model/1136281-prusa-xl-modified-left-and-right-y-carriage-for-to

Thanks for the link...... this seems what I was looking for

 

Respondido : 21/01/2026 12:32 pm
1 les gusta
jan.d.slay
(@jan-d-slay)
Estimable Member
RE: mk4S X-Axis Pully bearing

Thanks for the link...... this seems what I was looking for

I'm glad to hear that. 👍 👍 

Prusa Core One - Fast & Clean Start Gcode
Prusa XL - Quick Start Gcode
Respondido : 21/01/2026 12:37 pm
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