How can I stretch a part of an object ?

I selected one side of the area I'm hoping to stretch (just want to add 2/3 cm) but if I press E (extrude) it's going in a weird angle, and don't seems to be the solution anyway.

How should I proceed?

Model in Blender

  • $\begingroup$ Ok, I found a way to extrude only with Y using the UI submenu, but that's still going inside the object, should I cut the object in two part, extrude, then put it back together? $\endgroup$ – Kevin Sep 17 '19 at 10:05
  • $\begingroup$ When you say stretch do you mean the part that is highlighted should be longer? $\endgroup$ – barkest Sep 17 '19 at 10:54

Ok, I found something, but surly is not the right way to do it, also having some issue with this method:

  1. Select one part of the side
  2. SHIFT + D to duplicate
  3. Delete the primary part of the side you just duplicate
  4. in edit mode select the vertex you want to stretch.
  5. press E then right click to cancel.
  6. on the submenu add the value you want (4cm in Z in my case)
  7. move it back together.

In my case it's not really smooth


  • $\begingroup$ Don't look smooth on blender, but the STL look smooth in the OS viewer or in a slicer software (3D Printing) $\endgroup$ – Kevin Sep 17 '19 at 10:24
  • $\begingroup$ Why don't you select the half of the model and move it along the Y axis? $\endgroup$ – FFeller Sep 17 '19 at 16:54

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