Build a Cardboard Postcard File

WHAT TO GATHER

Your starting kit.

Clean, dry cardboard with uncrushed edges
A ruler, pencil, and scissors suitable for the board
Paper glue or paper tape as required by the joins
Scrap cardboard and a protective work mat

STEP 01

Measure and prepare

Measure a stack of A6 cards and mark a base slightly wider and deeper than the stack footprint.

STEP 02

Lay out the construction

Cut a base with four fold-up sides about 60 mm high and leave small corner glue tabs.

STEP 03

Join and shape

Score the folds, glue the tabs inside the corners, and add simple paper dividers after drying.

STEP 04

Check the result

Use a shallow file for lightweight cards and keep the opening wide enough to remove them easily. Let all adhesive dry before fitting the intended lightweight contents. Place the project on a flat surface and check that its joints sit square. If a slot tears or a wall leans, remake that piece from sound cardboard rather than hiding the weak join with decoration.

STEP 05

Finish and keep

Smooth exposed rough edges with a thin paper covering where needed, without blocking working slots. Keep the project away from water and heat. Recheck the joints after a few uses and replace a worn piece if it bends or loses its shape.

Before you begin.

How wide should I cut the slots?

Measure the cardboard thickness and test a slot on an offcut. The pieces should slide together with light pressure; forcing them can crush the corrugation and weaken the join.

What should I check before beginning?

Use a shallow file for lightweight cards and keep the opening wide enough to remove them easily.

Original editorial project guidance. Images are AI-generated concepts, not photographs of tested finished projects. Practice on inexpensive materials and follow tool and material instructions. Sources & approach.

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