Is this 3D model free to download?

Yes, Prusa I3 MK3 Y axis Adjustable Belt Tensioner is free to download from Thingiverse. Open it in the free Thinger app, or use the "Download from Thingiverse" link to open the original listing by the creator.

Where do I download the STL file?

The download is hosted by Thingiverse. Use the "Download from Thingiverse" link on this page to open the original listing and grab the file, or save it to your print queue in the free Thinger app.

Designed by MattyVee, published on Thingiverse. Please credit the creator when sharing your print.

Can I print this at home?

Yes. This is a printable 3D model intended for home FDM and resin printers. Check the original listing for suggested print settings.

Prusa I3 MK3 Y axis Adjustable Belt Tensioner

Source: Thingiverse by MattyVee

The Prusa I3 MK3 Y axis Adjustable Belt Tensioner is a free printable 3D model from Thingiverse by MattyVee. Update 3/10/18 - I used jzkmath model of the assembled prusa i3 mk3 with the r2 components and found that the tensioner still works with the r2 belt holder, maintaining a belt. You can download the STL file from the original listing below and print it at home.

Open in Thinger (free) Download from Thingiverse

81 saves Source: Thingiverse Updated 2026-10-08

Tags: Prusa, I3, MK3, Y, axis, Adjustable, Belt, Tensioner

About this model

Update 3/10/18 - I used jzkmath model of the assembled prusa i3 mk3 with the r2 components and found that the tensioner still works with the r2 belt holder, maintaining a belt path that is still parallel to the bed. Update 2/28/18 - Please refer to the picture of the two parts in Slic3r that I have uploaded. This is the proper orientation for printing the parts so that there is no need for supports. After a lot of design reviews and changes I've finally landed on a design that I think you will all like. It is simple and works like a charm. It is available to those using the stock idler (although I'd strongly advise an upgrade to a dual bearing unit), a gt2-16t idler (no more than 8.4mm wide) or a gt2-20t idler(no more than 8.4mm wide). When downloading the STL files, please be sure to sele…

Frequently asked questions

Is this 3D model free to download?: Yes. Prusa I3 MK3 Y axis Adjustable Belt Tensioner is free to download from Thingiverse. Open it in the free Thinger app, or use the "Download from Thingiverse" link above to open the original listing.
Where is the STL hosted?: The download is hosted by Thingiverse, not by Thinger. We link you directly to the original listing by MattyVee.
Who made this model?: Designed by MattyVee, published on Thingiverse. Please credit the creator when sharing your print online.
Can I print this at home?: Yes. This model is intended for home FDM and resin 3D printers. Check the original listing for suggested print settings like layer height and supports.