If you use facebook you will find a lot of vids here https://www.facebook.com/BoxGifs/videos
And on the Sketchup forum there is a long thread with more, https://forums.sketchup.com/t/out-of-the-box/68182/1
Some of the vids are on both some are not.

Looks like a tiny face issue, when it goes around the curve it is failing to form the tiny faces.
Scale up by 100 and try again.

@pipingguy
yes there are ways to trim images, Tig's SKM tools for example.
But the design you show is a simple mirror, radial array of a small number of arcs. Broken down it is very simple to reproduce.

Ah ok, that would be nice as I don't have one of those.
But give it time I'm sure you'll get to love it.

@L-i-am
Here's a version I did in mid 2023.
https://youtu.be/xZawPNj6aio

With a shortcut key for Make Component, G by default, you only need to hit Enter to complete the action if you don't want to name the component.

@Christian_33
You can taper a curved cylinder by using selective edge welding.

So your model is incorrect, the original is not a semicircle.

You could also try Chris Fullmers Shape Bender. Note how tapping the up and down arrow changes the preview, and then Enter to complete. I through the ellipses in to show how it reshapes things.

It's just an arc, why do you need a plugin. Draw the arc and use follow me to create the extrusion. Unless I am missing some detail.

@Alohaa My guess is you have opened the wrong model file.
Pretty clear here that Dave's model contains correct geometry.

Dave has explained this many times, if you are doing this for 3d printing there is no need to scale down.
In this image you see what was a 1m by 5m shape exported as 'model units' when opened in Cura you see that it has read that as 1mm by 5mm.

It could be that you have scaled a group or component, components have the option to Scale definition, which will correct the stretching.
With groups it is easiest explode and regroup.

@Alohaa Create a suitable profile and use follow me.

From 8ish years ago.
https://community.sketchucation.com/topic/151651/vectary-ultimate-3d-tool

There should be no reason for explode not working. Having said that you don't need to Import .skp files, just open them.
Create new/Open from My device

It sounds more like a question for a slicer forum. Understanding the ins and outs of infill is not really a sketchup thing.

I don't really get why you don't just make the shape you want and take the shapes from it.
Here's a quick version where all points are the same and although I have used two components, the second is just a mirror of the first.