I would like to fill in the base of this geometry (red lines) so that it can be printed as a Vase. I thought the boolean operators would work but to no avail. Any tips?

enter image description here

enter image description here

  • $\begingroup$ You mean you want that stat shape to be filled in or you want that entire part to be flat and cylindrical? $\endgroup$ Nov 7, 2021 at 21:58
  • $\begingroup$ I want to retain the material within the Star boundary and remove the outside, ie remove the circular boundary. $\endgroup$ Nov 7, 2021 at 22:24

1 Answer 1


First of all, you don't need that cylinder for the base, delete it. I suppose you wanted the height of the cylinder as the thickness of the vase bottom. The best thing to do with such a geometry will be the following:

  1. Select the star object and press Tab to go into Edit Mode.

  2. Select everything with A, then convert Tris to Quads with Alt+J. This is not necessary for 3D printing but makes the next steps easier.

tris to quads

  1. Deselect everything with Alt+A, then select the second row of vertices from the bottom on the inside of the object. You can do this by clicking between two vertices in a row and holding Alt. You have to repeat this on all sides, hold Alt+Shift while left-clicking to add selections.

select edge loop

  1. Now that you've selected the inner edge loop, press F to fill the hole with a new face.

fill inner face

  1. Next select the row of vertices below the new face. After selecting the complete edge loop, hit X > Delete > Vertices to delete the edge in order to delete the two bottom rows of faces.

delete bottom faces

  1. Now select the last bottom row of vertices on the inside. After the complete edge loop is selected, press F to fill the bottom with a new face.

select last row

fill bottom

  1. At last, check Face Orientation in the Overlays menu to see if the object shows completely blue faces. Also look inside the vase from the top. If there is anything showing up in red, select all with A, then press sHIFT+N to Recalculate Normals.

face orientation

  • $\begingroup$ perfect instructions! Thanks! The last step was crucial to remove the "Bad Contig Edges" in the 3d-print tool. $\endgroup$ Nov 8, 2021 at 18:05
  • $\begingroup$ @user9106985 Good to know, I had no idea what you needed for 3D printing, I just created a bottom for the vase 🙂 $\endgroup$ Nov 8, 2021 at 19:14

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