Can I scale the object with the part of it?

[ye3873 (YongWoo Sin)]

Can I scale this object by applying the length of the red line?

When I know the dimensions of only small parts and don’t care about the size of whole object, how can I scale it accurately?

[Nanomanpro]

“Exact Edit” addon should be of help to you:

Exact Edit: set exact distances or angle measures between objects

Download links Note: Exact Edit versions before 0.3.0 only work with Blender versions 2.77 through 2.79 Exact Edit versions from 0.3.0 onward only work with Blender versions 2.80 and newer Version 0.3.4 (latest release) Version 0.2.0 Older releases Gumroad page Keyboard shortcuts are shown at the bottom of the 3D View while the add-ons are running, for the full documentation, please visit the add-on’s wiki page Overview Exact Edit is a set of tools designed to make certain kinds of pre…

Precision Addons for Blender 2.82 Modeling ( Tutorial Part - 6 )

[DeckardX08]

As far as default tools are concerned, you can enter exact size in units to Dimensions field (N panel - Item - Dimensions) and its scale multiplier will be recalculated accordingly. It may not give exact result that you want if the object’s origin is outside an actual mesh (Dimensions are calculated for bounds of the mesh vertices)

Gyazo

[AgentTuron]

Hi there,
I usually go by manual calculation in Blender. Multiplying, dividing, mostly calculating linear relationship.
I admit, I am not exactly sure about your plan, but you should be able to calculate any percentage based on linear relationship, and simply re-size based on that number.