Printed part dimensions  

RE: Printed part dimensions

You can try reducing the width of Print Settings-->Advanced-->External perimeters to get more precision.  Also, try reducing your overall flow rate if you suspect over-extrusion.

RE: Printed part dimensions

Additionally, make sure you are exporting your STL with sufficient resolution.  Circles get converted to polygons so you want a lot of vertices.  Unless it is a very large highly detailed model you won't run into file size issues.

Also if you really want a nice fit, get a set of metric drill bits or reamers and use them to reach final dimension (in which case you can probably leave your print settings as-is if you are otherwise satisfied).

Finally, since you claim to be a newbie, I would offer this advice I learned the hard way.  *Do not* be tempted to compensate for the inaccuracies of your printer in your drawings (i.e. make your i.d. 4.08 in the drawing).  Especially if you plan to share your models.  I used to do this on my first (non-Prusa) printer and those models only worked well on that (poorly tuned) printer - had to tweak them all back when I got a new printer.  Draw what you want and learn to get the printer to print it.  The error you are seeing is fairly normal for an un-tuned printer but you can definitely improve on it.

RE: Printed part dimensions

Thank you for your answer.

I didnt think about the resolution even though I had seen it before. I will not change the values in my designs thats a good rule. So far the prints on the Mini are pretty decent at least for me since this is my first printer. But as I move forward it try to pay attention to details. Little by little I will make all the adjustments needed to get a totally satisfying result. So far so good.