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https://photos.google.com/share/AF1QipM6N7e-ZtVL0fwkwy3ro-GcIc6N8B31TkXccejEsRnbLwbFGzJ-_8oVY9HKey7FxQ?key=VjVvekRZbm5vQzdHUUhEQ0p5dWkySlVWOWJoLV9R

enter image description here

I want to make all circles with same thickness.

Also with different dimensions in circles but scaling changes the thickness of the circle.

Please provide me solution.

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    $\begingroup$ Your image is missing in the post. Please don't use photos of your screen, these have poor quality and are hard to read, take a screenshot instead $\endgroup$ Feb 19, 2018 at 3:15
  • $\begingroup$ I find a literal screenshot once in a while refreshing and funny, actually. $\endgroup$ Feb 19, 2018 at 15:23
  • $\begingroup$ To make screenshots in blender use Ctrl+F3 you can choose to save the Full Screen or just the active window. $\endgroup$
    – user1853
    Feb 19, 2018 at 23:24

2 Answers 2

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One way of doing this (it may not fit your workflow, though) is using an array modifier, fitting and following a circled curve (you can create a mesh circle, then convert it to curve with ALTC in object mode):

First, you create a thin rectangle that will fit and then follow a curve, with modifiers. A thinner rectangle will give (as replied by array) higher resolution of the curved shape.

enter image description here

which produces this:

enter image description here

to make another circle, of the same width, duplicate both curve and rectangle, first:

enter image description here

then, scaling the curve, will keep the same width:

enter image description here

another bigger curve:

enter image description here

If you need to have just static meshes, you can then apply (in order) modifers... (maybe keep a "dynamic" copy to create new ones...)

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enter image description here

To the right is a single nurbs circle which I opened with ALTC in Edit Mode and turned into a half circle by deleting one control point.

To the left is a former mesh with three edges which I turned into a poly curve (again with ALTC, just this time in Object Mode)

The left curve becomes the bevel object of the right curve. All one needs to do in order to change width or diameter of the circles is to move or scale the short curves to the left inside Edit Mode.

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