Noob question: how to fix this UV unwrap

[PhoxyShmoxy (Valery Chutak)]

Hi!
try to unwrap the whole thing using Tube Unwrap

UV Equalize and Tube Unwrap addons (updated)

Hello, i’ve got a big update of Tube UV Unwrap, read below… Tube UV Unwrap UV unwrap tube like meshes (all quads, no caps, fixed number of vertices in each ring) notes: Works only on tube-like parts of mesh defined by selection and active vertex (therefore you must be in vertex selection mode) and the selection must have a start and an end ring. Tube-like mesh is: all quads, no caps, fixed number of vertices in each ring. (Best example of such mesh is mesh circle extruded several times or b…

After that you can just find the UV part of your interest.
Also I think UV highlight will help you in this.

Addon similar to UV Highlight for 2.80?

Hmmm I can’t get it to work either, it doesn’t show like on your video @Mephist0 Got this error in the console: File "C:\Users\chafouin\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons\uv_highlight\props.py", line 5, in toggle_preselection updater.handle_toggle_preselection_state() File "C:\Users\chafouin\AppData\Roaming\Blender Foundation\Blender\2.81\scripts\addons\uv_highlight\main.py", line 289, in handle_toggle_preselection_state state = self.settings.show_presel…

(scroll down to the bottom of the page and you will find the latest version in a comment)

UV mapping in pure Blender is a bit tedious and time consuming, you will need a bunch of addons to UV unwrapping.