Paper model kits (papercraft buildings)

Card stock, not ordinary paper. Thin printer paper buckles, will not hold its shape, and makes flimsy models, whereas a heavier card holds crisp folds and stands up as a solid building. Many builders print directly onto card of around 160 to 250 grams, choosing heavier card for larger structures. Using the right weight of card is one of the simplest things that separates a sturdy model from a floppy one.

Because they are not scored first. Folding card without scoring lets the bend wander and round off, giving wavy walls and poor corners. Run a blunt scoring tool or the back of a knife along each fold line against a ruler, pressing a groove without cutting through, then fold along it. Scored folds bend sharply exactly where you want, giving the clean architectural edges that make a building look crisp.

Colour them with a fine marker. Every cut exposes the white core of the card, and these pale lines along brickwork and stone instantly reveal the model as paper. Run a marker or coloured pencil matching the printed surface along each cut edge, brown for brick, grey for stone, and the white disappears. This quick edge-colouring is the biggest single improvement to a papercraft building's realism.

Reasonably, especially if sealed. A well-built card model is sturdier than people expect, and a light spray of matt varnish protects the surface, adds water resistance, and toughens it for regular handling, which is why gamers and railway modellers seal their buildings. Paper models will not survive rough treatment like a plastic kit, but sealed and handled sensibly they last for years on a shelf or layout.
⚠️ Craft knives are very sharp and used heavily in papercraft, so always cut against a steel ruler on a mat, away from your fingers, and change blades when they dull to avoid slips.