Dimensional accuracy

[schafe 3]

I use Blender to design all of my 3D prints and Cura to slice them.  It has never bothered me that the things I design don't come out to the precise measurements I see in Blender.  Now I am working on a project where the parts need to fit precisely and I am doing many test prints to get the fit right. 

Is there something I might be doing incorrectly, or is this a common experience?

Thanks

[gr5 1,627]

Cura has some "new" (a year or two old now) profiles called "engineering" which are more precise (and not as pretty) but they are only available for the S5 and newer profiles.  But the good news is you can apply the same overrides to any profile.  Here is what engineering settings have setup:

 

dimensional accuracy profile - engineering settings  - accuracy mode
Line width: 0.4
Wall thickness: 1.2
Top/Bottom thickness: 1.2
Speeds: 35-40 (first 7 speeds, all except travel)
Jerks: 20
Horizontal expansion: -0.03
walls: 3
Inital Layer Height = 0.1
Slicing Tolerance = Exclusive
Combing Mode = off
Outer before Inner Walls = Checked

[schafe 3]

I'll try it.  Thanks