Designed for 6mm GT2 Timing Belt
If the fit is too tight, try resizing the model or account for shrinkage in your slicer settings.
Dimensions
Standard: 10.06 x 4.18 x 7.40 MM
Taller/Mirrored: 10.06 x 4.18 x 8.80 MM
Update
The author marked this model as their own original creation.