Creating Curves with LEGO: Advanced Shaping Techniques
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LEGO bricks are rectangular, so curves come from combining parts: curved slopes and arches for profiles, macaroni and round bricks for circles, jumper plates and hinges for gentle angles, and sideways building to hide studs. This guide shows which parts do what and how to combine them.
LEGO bricks are rectangular, so there is no single curved brick that solves every shape. Smooth curves come from combining parts: curved slopes and arches for rounded profiles, macaroni and round bricks for circles, jumper plates and hinge plates to step or angle a wall by less than a full stud, and sideways building to turn curved surfaces outward. The rest of this guide covers each family of parts and when to reach for it.
Curved slopes and arches: rounded profiles
Curved slopes are the most direct way to round off a shape. The stud-free versions give the smoothest surface: the 2x1 curved slope (11477), the 3x1 (50950), the 4x1 double curve (93273) and the 2x2 curved slope (15068). The 1x2 curved-top brick (6091) rounds the top of a wall or a fender. Arch bricks such as the 1x3x2 curved-top arch (6005) and the thin 1x6x2 arch (15254) curve a span over a door, window or bridge.
Placed normally, these parts round the top of a build. Mounted sideways, they can form the outside of a car body, a wing or a hull, which is how many display models get their smooth sides.
Porsche 911: build either the Turbo or the Targa. A good set to study how a rounded car body is shaped from curved parts.
Macaroni and round bricks: circles and corners
A macaroni brick is a 2x2 round corner brick, a quarter circle; the current version is 85080. Four of them make a ring, the fastest way to build a round tower, a column or a well. Round 1x1 bricks, round plates such as the 1x1 (6141) and round tiles such as the 1x1 (98138) and 2x2 (14769) make small cylinders, posts and smooth round tops. For larger round shapes, round plates of different sizes stacked or set side by side approximate a curve, and curved macaroni tiles finish the top.
Offsets and hinges: gentle angles
A full stud is 8 mm, which makes a stepped wall look jagged. Jumper plates fix that by shifting what sits on them by half a stud: the 1x2 jumper (15573) and the 2x2 jumper with a center stud (87580). Stepping each layer of a wall by half a stud gives a far gentler curve than full-stud steps. Our offset and jumper plate guide covers these in detail.
For angles that are not right angles, hinge plates turn whole sections of wall. The 1x4 swivel hinge pair (2429 and 2430) lets you set a wall at almost any angle, and several short hinged sections in a row approximate a curved wall. Wedge plates such as the 4x2 pair (41769 and 41770) round off the corners of a deck or a roof without hinges.
Building sideways: hiding studs
Studs on top break the line of a curve. Building sideways, or studs not on top, lets you attach curved slopes and tiles so they face outward. Brackets (99781 and the inverted 99780) and bricks with studs on their sides, such as the 1x1 (87087) and the 1x2 with two side studs (11211), give you the attachment points. The headlight brick (4070) is useful too: its side stud is recessed by half a plate, so it gives a half-plate offset rather than a half-stud one. Our SNOT guide explains the geometry.
Flexible parts and ball joints: organic shapes
Flexible hoses and tubes, held in clips or pushed through Technic holes, make cables, pipes and decorative swoops that rigid parts cannot. Ball joints let limbs, tails and necks sit at any angle, which suits creatures and mechs.
Putting it together
- Pick the scale first. A curve that looks smooth on a large model looks stepped on a small one, so larger models can use simpler techniques.
- Combine families. A round tower might use macaroni bricks for the walls, round plates inside for strength and curved slopes for the roof edge.
- Prototype. Try a curve digitally in BrickLink Studio or an LDraw editor, then test it in real bricks; hinged and offset sections need to hold together, not just look right on screen.
- Finish with tiles. Tiles and stud-free curved parts on the outer layer do most of the work of making a curve read as smooth.
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