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I am learning Blender and come across this instance often yet still can't figure out how to solve it. If I have a wall and I want to cut a hole out using boolean difference, how do I place the object to do the cutting at a specific measurement from the edge of the wall? Say for example, .880m from the edge. (I have my units set to metric)

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  • $\begingroup$ You can place the door along the edge and move it the distance you want. $\endgroup$
    – lemon
    Sep 10, 2020 at 5:26
  • $\begingroup$ Ok thank you! Though I am going to clarify what you said a bit more for anyone else who may come across this problem as it took me a couple of minutes and a bit of fiddling around to realise what you meant (I thought you meant the edge I was on. Doh). Snapping my door to the LEFT hand edge (the short edge that runs along the x-axis in the photo) and pressing enter then allowed me to move the door object back again on the y-axis but now I can enter the numerical value/see the correct value in the top left because I am moving from the right place of origin. $\endgroup$ Sep 10, 2020 at 5:46
  • $\begingroup$ .. and if your measurements are repetitive, you can think like a carpenter, and keep your own collection of home-made measuring-rods and wedges, which exist only to snap, and be snapped to. $\endgroup$
    – Robin Betts
    Sep 10, 2020 at 6:11

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You can use snap to attach the face to the wall edge:

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Then use typing move to manage your door to the desired position:

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