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Blender

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  • $\begingroup$ did you check face orientation? if yes, pls provide blend file $\endgroup$ Commented Nov 24, 2022 at 5:37
  • $\begingroup$ No I didn't check the face orientation and have never used in unless accidentally. I hope that I have now uploaded the blender file at the 'exchange' $\endgroup$ Commented Nov 24, 2022 at 6:11
  • $\begingroup$ To find out what you are doing wrong it would be best to see what you've done. You said you've tried Difference - so I guess you used a Boolean modifier, but there is no Boolean modifier on any object in the file. When I use it, set to Difference, the red box is cut out of the 'gutter'. So I can't tell what you did wrong. $\endgroup$ Commented Nov 24, 2022 at 6:43
  • $\begingroup$ @chris Sorry Chris I didn't save the blend file when I encountered the problem and so had to 'recreate it' and as I though I wasn't using the correct 'tool' didn't bother selecting the boolean modifier. I have now worked out that I am selecting the wrong mesh before adding the boolean modifier. I now have it working. I have only ever used the boolean modifier once before and fell into the same trap (selecting incorrect mesh to add to). Sorry $\endgroup$ Commented Nov 24, 2022 at 7:10