[commandar]

>Changing dimensions or previous sketches is usually fine, but anything more complicated often results in everything in your stack breaking with strange errors, leading it to just be easier to re-create the model.

This is usually the result of design workflows and how you avoid it is going to vary based on the CAD package. It definitely requires being pretty deliberate in design, which can make it harder to draft out an initial design. And the path of least resistance is often one that's more likely to break.

One example would be in Fusion, using projected faces in sketches is far more fragile than projecting a body -- but Fusion will happily project faces by default.

Which constraint types you use where are another common cause of breakage.

The thing that makes it frustrating is that none of this is really well documented anywhere and largely ends up being best practice wisdom passed from one person to another, since a lot of this stuff is really non-obvious. And it's confounded yet again by people cargo culting best practices from one CAD package to another that then gets repeated third and fourth hand.

All that said, as you work with it more and delve into more complex designs, you'll end up settling into workflows that result in more resilient models if you're deliberate about it. The "scrap it and start over" cycle is part of the learning experience, IME, as frustrating as it is at the time.