absolute beginner here,

I'm trying to get a 3D printable .obj or .stl file by using a displacement modifier from a greyscale heightmap on a simple plane in blender.

In order to be printable, the plane needs to be closed at the bottom, which I can't manage to do and tutorials for the solidify modifier didn't seem to help.

Thank you for your help!

This is how far I've gotten, but the plane sadly isn't printable

enter image description here

This is what happens when I try to extrude the plane:

This is what happens when I try to extrude the plane.

  • $\begingroup$ You can use Boolean modifer with a simple cube put to the bottom of the mesh $\endgroup$
    – Mr Zak
    Dec 1, 2018 at 11:49

2 Answers 2


At its simplest,

  • EZ extrude the perimeter of your plane,
  • F fill the base

enter image description here

In this example, a Subdivision (Simple) followed by a Displacement modifier, are restricted to a square vertex group in the plane, leaving a margin around the outside.. so the extrusion and the fill are not affected by them .. the rest of the box is clean, undisplaced geometry.

  • $\begingroup$ Thank you for your response! Whenever I try to extrude, my model turns into something weird looking. I'll try to attach a picture to clarify. $\endgroup$
    – Lodemini
    Dec 1, 2018 at 10:54
  • $\begingroup$ @Lodemini See edit.. does that help? $\endgroup$
    – Robin Betts
    Dec 1, 2018 at 11:26

Grid Fill should work. Please search for grid fill. You may be able to select the bottom perimeter and let grid fill do the work for you. Once you search this is an 8 second operation.

Another option is to start with a Cube so the mesh is closed in the first place. Loop Cut to create the terrain vertex density. (Perhaps you already did this loop cut in your original question) Loop Cut can create a top half and bottom half. The top half can be a [vertex group] named "Top". Then the displacement modifier can applied to the vertex group named Top.

Perhaps you can just use displacement modifier on the whole cube to save plastic. I do not know the particulars of any required support structures required for your 3D print. You may not need the wasted plastic when the top may be the visible and important version. The bottom may not be so important.

Other methods exists to do the same thing in Blender as always.


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