Is this 3D model free to download?

Yes, Prusa MK3, MK2S X-Axis 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 mhoyt, 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 MK3, MK2S X-Axis Belt Tensioner 3D printable model by mhoyt

Prusa MK3, MK2S X-Axis Belt Tensioner photo 1

Prusa MK3, MK2S X-Axis Belt Tensioner photo 2

Prusa MK3, MK2S X-Axis Belt Tensioner photo 3

Prusa MK3, MK2S X-Axis Belt Tensioner photo 4

Prusa MK3, MK2S X-Axis Belt Tensioner

Source: Thingiverse by mhoyt

The Prusa MK3, MK2S X-Axis Belt Tensioner is a free printable 3D model from Thingiverse by mhoyt. I had a difficult time getting the belt tension I was looking for when assembling the MK3 printer. You can download the STL file from the original listing below and print it at home.

Open in Thinger (free) Download from Thingiverse

566 saves Source: Thingiverse Updated 2026-10-25 License: CC-BY · commercial OK 8 makes Category: 3D Printer

Tags: prusa i3 mk2s, prusa i3 mk3

About this model

I had a difficult time getting the belt tension I was looking for when assembling the MK3 printer. I wanted more adjustment then what is available by rotating the stepper motor when tightening. Once assembled it is also difficult to get back in and tighten the belt on the X-Axis carriage. So I designed a simple plate that mounts to the motor and has slots to allow for tightening the belt. Assemble the plate on to the X-Axis motor with (4x) M3 x 10mm screws, I had these in my Spare Parts Bag. Install (3x) of the square M3 nuts (also in Spare Parts Bag) in the slots then assemble to the mount, leave slightly loose. I used a screw driver between the motor and the frame for leverage to get the belt tight and then fully tightened the 3 screws. I also flipped the pulley on the motor around 180 d…

Frequently asked questions

Is this 3D model free to download?: Yes. Prusa MK3, MK2S X-Axis 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 mhoyt.
Who made this model?: Designed by mhoyt, 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.