Transitions
One shape to another between two ends. Each of these opens in the browser with default sizes that already give a verified flat pattern: change them to yours, check the drawing, add seam and flange allowances, and export.
Rectangle to Rectangle
Hoppers and duct transitions between two rectangular ends, centred, offset or inclined.
Open Rectangle to RectangleRectangle to Round
Square-to-round transitions with flat sides and conical corners, offset or inclined.
Open Rectangle to RoundRound to Oval
A round end to a flat-oval end: flat triangles under the straight sides, curved parts round the ends.
Open Round to OvalRectangle to Oval
A rectangular end to a flat-oval end: flat panels on the long sides and parts of cones at the corners.
Open Rectangle to OvalRectangle to Ellipse
A rectangular end to an elliptical end, or an ellipse to a rectangle: concentric, offset, eccentric or with angled faces.
Open Rectangle to EllipsePolygon
A regular polygon, such as a hexagon or an octagon, to a circle or to another polygon.
Open PolygonTwisted Rectangle
A transition between two rectangles, one of them turned about the axis; its twisted sides are split into flat triangles.
Open Twisted RectanglePyramid Hopper
A four-sided pyramid between two rectangles, such as a hopper or a plenum, with or without flanges turned outward.
Open Pyramid Hopper