Once I have built a torus / doughnut shape, is there an easy way to increase the accuracy of the underlying geometry?

i.e. When I go: View ==> Hidden geometry, I want to increase the number of segments in the circle. The reason why I want to do this is because I am going to want to use the shape for 3D printing and I am going to need things to be pretty accurate when I add/remove stuff.

Or should I build the torus from scratch but using a circle that has a greater number of steps (or whatever the word is - “segments” ?)

Notice that the shape is the product of two circles: the profile and the path. Each contributes to the granularity of the final shape; to ensure a mesh that is uniform in both directions, change the number of segments for both circles.

Would 2 to the power of something be even better? e.g. 128.
Either way would 128 be a reasonable number for a smallish slightly complex 3D shape that will have lots of curves?

PS What is the convention here - does it matter who’s answer I tick? Does it matter if I ask more than one question in a thread or would it be better to ask them in separate threads?

I have a number of radiuses (‘radii’) that are 4.5mm

I dont know if it helps but I opened the “3D Printing - Millimeters” template.

Are you saying I should draw at 10x larger scale and then shrink everything to one tenth when finished. (Please tell me x8 is better because that would be a serious pain converting all my dimensions)

From Gully’s link it looks like 32 sides would be a reasonable place to start.

You can try any factor you like. The need is to get the geometry larger than SketchUp’s built-in tolerance of about 0.001 inch. In metric, powers of 10 tend to be easy to work with. In Imperial units, almost any scale factor is a pain! Quick, what is 5 3/16 inches when scaled up by 20?