Knife Project - Extrude through thickness?

Question

Is it possible to use the Knife Project tool to somehow cut through thickness and extrude the edges that are formed?
I'm trying to cut through these 4 faces (2 "cubes") but Knife Project only intercepts a hole into one face. I would like it to extrude the face through multiple planes.

Do I simply do this 4 times and connect the edges into faces manually?

enter image description here

There are some know limitations, which may be the cause of your problem: http://wiki.blender.org/index.php/Doc:2.6/Manual/Modeling/Meshes/Editing/Subdividing/Knife_Subdivide#Known_Issues — someonewithpc, Jan 04 '15 at 23:09

score 10 · Answer 1 · answered Jan 05 '15 at 00:11

Actually, you only need one single circle here instead of two.

First, after using Knife Project, find Cut Through on the lowerleft corner of the Toolshelf bar, or toggle it on the F6 panel.

enter image description here

Second, select each pair, then W -> Bridge Edge Loops, to build faces between them (solidify the holes).

score 4 · Accepted Answer · answered Jan 05 '15 at 01:53

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Replace your circle with cylinder object and do boolean difference with your main object. enter image description here

answered Jan 05 '15 at 01:53

JuhaW

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Knuckles209cp · Answer 3 · 2015-01-05T00:19:05.540

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Since the mesh you are cutting is flat , you can cut on one side

enter image description here

Move the circle to the other side and make a knife project

enter image description here

then you can start filling in the hole by making quads/Faces by using F and selectng 4 vertices . enter image description here

edited Jan 05 '15 at 00:19

answered Jan 05 '15 at 00:06

Knuckles209cp

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The last step can be made much faster by using [Ctrl]+[E] > bridge edge loops. – PGmath Jan 05 '15 at 01:49
I didnt know that , thats also helpful for me ^_^ – Knuckles209cp Jan 05 '15 at 04:01

Knife Project - Extrude through thickness?

3 Answers3