When I do a check manifold both objects have 0 non-manifold edges but when I combine them it becomes non-manifold and when I try and fix this it covers the hole which will have the screw in it. How can I make this manifold without it covering the screw hole. This is to be 3D printed and my 3D printer doesn't like non-manifold objects.
The box with the threads inside of it has been tested to work well when printed with my 3D printer so I just want to continue to re-use it without adjusting it's scale.
PS: I checked for doubles and did merge by distance.
How I did the join:
- Select screw/nut or object that will make hole
- Select object that will get the hole
- Ctrl (-) (do a boolean difference)
- Apply modifier
- Select both objects and select Join
When I click Make Manifold it covers up part of the screw hole at the bottom.
I'm using Blender 2.90 Blend file is attached