Extruding not Substracting as it Always did

Need help? We are here.
1

I am trying to create a recess in a threaded tube (internal thread).
I draw a circle the size of the recess I need in different ways, but none are working as expected.

  1. on the objects face
  2. on a plane flush with the face I need to recess
  3. on a plane distant from the face I need to recess

Instead of recessing (substracting body), a new body is created.

When I reach a certain distance (larger than the recess I need, it starts working as it should. Why not right from the surface of the body?

Help please! :slight_smile:

https://support.shapr3d.com/hc/en-us/requests/new

2

There’s a tiny menu icon that pops up when you start the extrude. Click on it and select Subtract.