How to Cut Holes in a 3D Model Online

Build a phone stand with a real cable opening, soft edges, and mirrored supports.

Beginner20 min practice

Start with a thin block

  • Open the homepage editor. Delete Camera. Select Key Light and turn off Selectable in Object → Visibility; turn off Cast Shadow in Light properties for this preview.
  • Choose Material Preview. Rename Cube to Back. Set Scale X/Y/Z to 1.7, 0.15, 0.16 and Location to 0, 0.15, -0.9. Choose Object → Apply Scale.

These are scene units, not millimetres. This is a visual prototype, not an engineered or print-ready stand.

Extrude and lean the back

  • From Top view, enter Edit Mode and choose Face selection. Select the top face.
  • Choose Face → Extrude Faces. Press Y, type 3.6, then Enter. With the new face still selected, press G, Z, -0.8, Enter to lean the back. Return to Object Mode.

Y is up in this editor. Moving only the top face creates the slope.

Soften the edges and add a base

  • Add a Bevel modifier to Back: Amount 0.06, Segments 3, Affect Edges. Apply it. Set Base Color to #268A91, Roughness to 0.32, and Metallic to 0.3.
  • Add a cube named Base. Set Scale to 1.9, 0.125, 1.45 and Location to 0, 0.125, 0. Apply Scale, then apply the same Bevel. Use #233646 for its color.

Place a cylinder through the back

  • Add a Cylinder named Cable cutter. Set Scale to 0.48, 1.4, 0.48; Location to 0, 1.25, -1.12; and Rotation to 90, 0, 0 degrees.
  • Orbit to check that the closed cylinder passes through both sides of the back. Give it a contrasting color so it is easy to see.

Subtract the cutter

  • Select Back and add a Boolean modifier. Choose Difference and set Operand to Cable cutter. Keep Fill cut faces enabled to make the inner wall of the hole.
  • Apply the Boolean before deleting Cable cutter. Then select and delete the cutter. Inspect the opening from both sides.

Mirror the front supports

  • Add a cube named Front supports. Set Scale to 0.38, 0.2, 0.27 and Location to 0, 0.4, 1.03. Apply Scale.
  • Enter Edit Mode, select all faces, and move them with G, X, 1.2, Enter. Return to Object Mode. Add Mirror on X only, then Apply.
  • Apply a Bevel with Amount 0.06 and Segments 3. Set the color to #E17D66. The recipe includes all material settings.

Moving vertices in Edit Mode leaves the object origin centered. Mirror uses that origin for the matching support.

Export and check the hole

  • Select the three mesh objects, leaving Key Light unselected. Use File → Save for the working project in this browser.
  • Choose File → Export, GLB binary, and Scope to Selected. Turn off Include animations and export. Keep the download as a separate backup.
  • In a new scene, remove Cube and Camera. Disable Import as group and Center imported asset, then import your exported GLB. Frame the stand and inspect the hole and supports.
A teal phone-stand back with a circular cable opening, a dark base, and two coral front supports in the homepage 3D editor.
Real cable opening · Mirrored front supports. Click to enlarge.

Keep going

The walkthrough uses the full editor. Explore these related workflows and standalone tools next.