Negated parts refuse to union cleanly

The Building Support sub-category is intended for all development support relating to architecture on the Roblox platform. This includes questions ranging in difficulty from extremely basic to even the most technical of issues.

You may present your thread how you choose, but you are required to answer the following questions in your thread;

  • What are you attempting to achieve? (Keep it simple and clear)
    To Be able to unionize a complex hole so I can negate it cleanly

  • What is the issue? (Keep it simple and clear - Include screenshots/videos/GIFs if possible)
    The hole has these lines that border the edge, making the union look ugly, no matter how much i try (i am using the menu at the top to unionize and negate it)

  • What solutions have you tried so far? (Have you searched for solutions through the Roblox Wiki yet?) Nothing yet, fiddling with it for over 10 minutes seems to be going nowhere.

You may then include any further details.
In the image, there is a clear line splitting the union into two, even though it is one single “part”. This leads to an

Unions have a poly count limit.
That could be an issue perhabs.
Hower when exported and reimported as mesh it could be fixed i think.

Try enabling the Studio solid modeling improvements beta and see if it works better.