This is a Parametric Shim Generator with a base setting to generate 4 shims from 1/32nd of an inch up to 2 inches.

Single sets can be generated as well to your specifications and print settings will be included as well to help you get the most precise print possible.

I have been able to get as lose as .0009" measured with a vernier caliper pictured above and will typically see the critical dimension step out as much as .003".

Remember these are 3D printed if you need an ultra precise machinist tool you should go buy it. This is a free version that will allow hobbyists and others to benefit from more precision than usual.