Subtract for Holes and Cutouts

Subtract is the most useful boolean for practical modeling.

Creating a Hole

To make a hole through an object:

1. 1Create your main shape (e.g., box)
2. 2Add a cylinder where you want the hole
3. 3Make cylinder penetrate both sides
4. 4Select box first, then cylinder
5. 5Click Subtract

Result: Box with cylindrical hole through it!

Selection Order

Critical for subtract:

• First selected = Shape to keep


• Second selected = Shape to cut away

Wrong order = wrong result!

Practical Examples

Drilled Holes

• Box + Cylinder = Hole
• For screws, cables, decoration

Cutouts

• Box + smaller Box = Window/door cutout
• For architecture, electronics cases

Carved Details

• Base + detail shapes
• For grooves, slots, recesses

Tips for Clean Subtracts

1. 1Tool should extend past surface

- Cylinder should poke out both sides
- Avoids thin artifacts

1. 2Keep it simple

- One cut at a time
- Easier to troubleshoot

1. 3Check from all angles

- Orbit to verify the cut
- Look for unexpected results

1. 4Name your results

- "Block_With_Hole"
- Helps track what's what

Common Uses in 3D Printing

• Screw holes
• Cable management holes
• Interlocking joints
• Lightening cuts (remove material)