PHONE STAND - BOOLEAN MODELING RECIPE
Online 3D Editor / How to Cut Holes in a 3D Model Online

Use the homepage editor. Values are scene units, not millimetres. Y is up.
This three-part visual prototype has not been engineered or tested for manufacture.

BACK
Default cube, renamed Back.
Object Scale X/Y/Z: 1.7, 0.15, 0.16
Object Location X/Y/Z: 0, 0.15, -0.9
Apply Scale. Top view; Edit Mode; Face selection; select the top face.
Face > Extrude Faces: Y, 3.6, Enter.
Move the still-selected top face: G, Z, -0.8, Enter.
Return to Object Mode.
Bevel: Amount 0.06, Segments 3, Affect Edges. Apply.
Material: #268a91, Roughness 0.32, Metalness 0.30.

BASE
Add Cube, rename Base.
Scale: 1.9, 0.125, 1.45. Location: 0, 0.125, 0.
Apply Scale. Bevel Amount 0.06, Segments 3, Affect Edges. Apply.
Material: #233646, Roughness 0.40, Metalness 0.10.

CABLE CUTTER
Add Cylinder, rename Cable cutter.
Scale: 0.48, 1.4, 0.48. Location: 0, 1.25, -1.12.
Rotation in degrees: 90, 0, 0. Temporary color: #f1bb64.
Select Back. Add Boolean. Operation Difference, Operand Cable cutter.
Keep Fill cut faces enabled. Apply the Boolean BEFORE deleting Cable cutter.
Inspect the opening from both sides. The actual exported hole radius is 0.384
because the editor's default Cylinder radius is 0.8 before scaling.

FRONT SUPPORTS
Add Cube, rename Front supports.
Scale: 0.38, 0.20, 0.27. Location: 0, 0.40, 1.03.
Apply Scale. Edit Mode, select all faces, G, X, 1.2, Enter.
Return to Object Mode. Add Mirror on X only; Apply.
Add Bevel Amount 0.06, Segments 3, Affect Edges; Apply.
Material: #e17d66, Roughness 0.40, Metalness 0.05.
Moving vertices in Edit Mode keeps the object origin at the center for Mirror.

EXPORT
Keep Key Light unselectable; select the three mesh objects.
File > Save keeps a working project in this browser.
File > Export: GLB binary, Scope Selected, Include animations off.
Reopen the downloaded phone-stand.glb in a fresh scene to verify the hole.
The exported GLB contains three editable mesh objects, not a fused print-ready solid.