I’m doing some building & despite the fact it’s on an angle; the Maths works out correctly as to where the Part needs to be placed…
I’ve even copied the top part and recaled to create the part along the side however I keep coming up with these odd lines? It’s making it a hassle when I’m CSGing too as they are turning into black prominent lines.
Does anyone have any suggestions?
It looks like it’s because of your Graphics Level. Try turning it up and see if it’s still an issue.
The reason you see these lines on low graphic level settings is because Roblox won’t care about tiny pixels because they’re trying to make the game look performant.
I’ll try that when I’m home!
Dont tell me that’s all it is because I actually wound up dismantling all the parts and doing them as a single part with unioning the parts out so there’s no connections! 
Unfortunately this was the solution.
._.
On the plus side, I minimised my over-all parts by about 20…
Thank you!