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The Prusa git repository does not convert T5 belt (5mm) to XL belt (0.20") when generating STL for the SAE version. The pitches are so close that the pulley appears to work, but the ratio of tooth to space is different so there is backlash when the pulley reverses as the small teeth slide in the large gap.
This is a variation of a 10t XL gear that Rick at MakerGear sells with his kit. His STL didn't print well for me due to slight printing inaccuracy causing the grooves in the pulley to fill up with material. This one is derived from an SCAD source here on Thingiverse. The grooves for the belt teeth are 25% deeper than nominal.
Rick's STL is on github: https://github.com/MakerGear/MakerGear-Prusa-Mendel
Print two (one for Y, one for X).
Drill out the hub to 5mm.
Insert a M3 nut in the base (yes, M3 even though SAE Prusa builds for #6 -- #6 is far too huge for a setscrew).
Recalculate your X/Y_STEPS_PER_MM as 200 steps/rotation 8 microsteps/step / (0.2 inches/tooth 10 tooth/rotation 25.4 mm/inch) = 31.496 steps/mm. Note that you must adjust this for XL belt even if you elect to use the original 8t pulleys because the distance moved is 0.2"8, not 5mm*8.
10t XL Pulley for SAE Prusa Mendel by BenJackson is licensed under the GNU - GPL license.
So what's this mean?
We're sure BenJackson would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!