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As part of my 'model' of a concrete apron for the top of a dock I have also created the 'gutter' using the mesh object for the apron (rather than create using single vertice and extrude again) which will be 'dropped' onto the apron creating a 'concrete apron' with a 'concrete gutter' around the edges (see image) below. In doing so I now need to remove part of that 'gutter' and considered using a boolean modifier. However I just can't get it to work. I added a mesh cube (colored red in the image below) with correct dimensions to 'cover' that part of the 'gutter' mesh object I want to remove and tried 'difference' but don't seem to be able to get it to work. Maybe I am using the wrong 'tool'?

enter image description here

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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

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if this is what you are looking for:

enter image description here

use this boolean modifier:

enter image description here

don't forget to choose an object - in your uploaded file no object was chosen so Blender cannot execute the boolean modifier.

Also make sure that the cutter is hidden - else you cannot "see" the cut.

And...the boolean modifier is on cube.001 ...you added yours to the wrong object - if i understood you right.

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  • $\begingroup$ That is EXACTLY what I wanted to achieve AND had achieved before you posted. I must have described it incorrectly but I achieved exactly what you show. Thanks again for your assistance. $\endgroup$ Commented Nov 24, 2022 at 20:41

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