Parts larger than they should be

[Gotham Pixel]

I'm trying to print an 8mm cylindrical part using S3D but it measures 8.5mm when printed. The print looks good but it's visibly larger. The same file prints fine with matching settings when sliced with Cura. Is there a particular setting that is causing this? I'm reluctant to trust S3D with a longer print if the tolerances are this far off.

Thanks for your help.

[Joey]

I've used the Ultimaker 2 with Simplify3D and didn't have any issues with tollerances. This calibration cube steps piece is suppose to be 25 mm, and even at 25.24, that's less than 1% error that I'm getting. Have you tried printing the calibration steps with Simplify3D? Also, what piece are you trying to print? Maybe upload your factory file and I can try to print it too. I am curious why you'd be getting such a large error.