To OP:
Don´t state how to make a part !
Unless and until You have experience and Big $$$.
So asking for rolling/spinning etc. with exact dimensions below 0.01 mm,
is a terrible idea.
Asking not to use a solid is a terrible idea !
Your print must have a defined wall thickness, and some form of tolerance for radius.
After that, You should care less if a solid piece was used to make it.
Explanation:
Machining from solid would be dead easy, fast to do, and very accurate.
Cheap.
It´s a 20$ part, machined from solid, you buy for 60$, in qty many, from endless suppliers here with decent lathes.
1.1
For qty 2 you might get 2 for 400$.
But 360$ of that is setting up, and dealing with the one tiny order.
1.2
For qty 2, if You need spinning for some weird reason, You might be looking at paying 2000$, or more, for 2, accurate to typical cnc shop standards of 0.02 mm +/- all-around as-dropped - sans distortion.
A part that is spinned, formed, whatever, will likely need final machining in a special fixture, You buy and pay for with the first order of 2 parts.
And may still need multiple cycles of heat treat, stress release, final machining, if you expect it to be anywhere near as accurate as a part machined from a solid piece.
2.
"Accurate" is very expensive, especially for 2, most especially where You specify "not solid".
I understand as not made from a solid billet.
3.
Always add details.
Explain what needs to be accurate, why, and how accurate.
Don´t say *everything*, it makes a 60$ part cost 20.000$.
Yes it does.
4.
If You want a part to be made fast, cheap, in the future, in high quantity, state so.
But spinning is not a cheap and accurate production method.
5.
Endless high-tech finishing methods can make extremely accurate parts, very fast, very very cheaply, on some features of the part.
They generally have setup costs == 5000$, which is not much compared to the 2 prototypes at 2000$+ each, via spinning/multiple secondary ops.
5.1.
E:
So a cone external or internal surface could be extremely accurate, vari-form (aka have complex shape),
made in 9-15 secs cycle time for the final op,
to about 0.01 mm final accuracy, +/-, or even better to a few microns if needed, for 30 secs cycle time and a bit more setup/tooling.
It´s called a rigid hone, aka custom diamond plated hone.
Cost == 3000$ custom made, last 3000.000 parts in one year, used a lot to make engine cylinder holes to spec.
6.
You cannot get a cheap accurate proto part cheaper by asking for "spinning" or whatever.
Ask for the cheapest way to make this in steel, of suppliers choice.
Ask what makes the part expensive to do.
7.
To get 2 excellent parts, offer money.
Offer say 700$ for 2, with needed guidance included on how to make them easier to make, cheaper to make, why.