I have recently decided to delve back into 3D modeling, I am a hobbyist I guess you could say. I have been trying to find a solution for this particular problem for days now. I have scoured this as well as other forums and have yet to find an answer to this dilemma. This is my first post here so I hope I don't make too much of a fool of myself :P

I am currently trying to merge three rectangular cubes to form a symbol: enter image description here

The problem arises when I goto render the picture: enter image description here

I have tried Joining the objects then going back with the Knife and removing doubles, which seems to be the answer to this, but I keep getting the overlap.

I am sure it is a simple fix but I have probably burned myself out on finding it.

Thanks in advance for any help or advice.

If I have managed to miss another answer to this in my search could you please link it.


You could do it with the TinyCAD addon or with some extrudes.

If you want to start with your 3 parallelepipeds you could use the TinyCAD addon:

  • Download and istall the addon.
  • Join your parallelepipeds with a ctrlJ, and go in Edit mode.
  • Select all and press W > TinyCAD > XALL.
  • Keep everything selected and press W > Remove Doubles.
  • Delete the inner vertices so that you won't have any inner edges in the final object.
  • Fill all the faces.

enter image description here

If you want to do it with some extrudes, you could:

  • Start with a plane, create an edge loop on its middle and tilt it with GG.
  • Bevel the middle edge loop with ctrlB and create 2 new edge loops.
  • Extrude the plane.
  • Select a face and press ctrlaltspacebar to create a new custom Transformation Orientation (named "Face.001" by default).
  • Keep this new orientation selected.
  • Select one of the faces you need to extrude, press E and Enter right away.
  • Move this new face along the Face.001 Y axis.
  • Same thing for the other face.

enter image description here

| improve this answer | |
  • $\begingroup$ Thank you very much for your help with this. After a bit of fumbling around with it I figured out I had to Join the parallelepipeds prior to switching to Edit Mode for the rest of the steps mentioned above. This was, I am sure, one of many hurdles in my self-assigned project and it is nice to have a place to go for advice. $\endgroup$ – Prometheus217 Jan 4 '19 at 23:26
  • $\begingroup$ oh ok I thought you'd know you would have to join ;) $\endgroup$ – moonboots Jan 4 '19 at 23:45
  • $\begingroup$ I am learning/relearning this world, again, after a few years. I am mainly doing it for fun but you never know where it can go. I am mainly using projects to learn more about the program. If there are any tutorials or informational material you would recommend that would be cool. I have googled about 100 tutorials and courses but just use them as needed. $\endgroup$ – Prometheus217 Jan 5 '19 at 0:32
  • $\begingroup$ hard to say, at the beginning I followed a lot of random tutorials that seem interesting, then a thing that helps a lot is to have my own project, for example create a fake animation movie trailer, which forced me to solve the problems I came across, like make a character walk, a camera follow a path, etc... I think it's the best way to learn: cope with problems to solve ;) $\endgroup$ – moonboots Jan 5 '19 at 9:47

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