I assume this is a common problem, but don’t know the word for it. But when I print a part it is typically about 5-6% larger than the 3D model on the outer diameters, and about 2-3 % smaller on the inner diameter. So basically when I’ve designed a model 100% according the a real life model, when it is printed it is either to tight on the inner parts, or two large on the outer.

I need to print something which is exactly as the model that I’ve created (or within 0-2 % at least). How do I go about fixing this. Is there a setting in Cura that I use, or do I have to compensate for the print differences in the designed model?

By the way Im using Sketchup, Cura and Vertex K8400.

To a certain degree, this problem will always exist. It doesn’t hurt to take this into account somewhat when designing your models, mostly just making holes a tiny bit bigger than they need to be. Try lowering your flow and measure the filament to make sure it is exactly how thick you think it is.

What sizes are we talking about? You gave percentages however 2% of a 1cm model is less than a typical line width while 2% of a 10cm model is more of an issue. Also what material are you printing with?

On my point of view, 5-6% is quite more than the printer should give you. And because you seem to tell it’s always approximatively the same percentage, you should think of calibrate your K8400.

Ok, so basically print a few of these test models and measure the actual sizes when printed.

I’ll try to do some of these this evening.


The easy part first, I’m printing with PLA.

The part that I am talking about is attached below. Don’t have the measurements in from of me, by I assume it is about 2-4 cm in diameter where I measured 5-6% larger on the outside.