how can i make 2 (CanCollide = false) part collide each other?
You can set their collision group. I believe theres a tab for it in view, if not, you can edit it in a script.
Some questions need answering (most are just for our information so we don’t tell you to do something you’ve done already):
Have you tried any ways to do it?
Have you researched any ways to do it?
What are you using this for? Is it a building placement system, or something to do with players/NPCs, or a collision system for vehicles/models?
As @CodedJack stated, Collision Groups may be your friend here. You can make these objects only collide with each other.
idk how to set it up and id even know how to use it
You didn’t click on the link I posted above.
create.roblox.com has explanations of how to build and script in Studio.
Also, please reply to the person you were posting to, otherwise they don’t get a notification that you replied to them.