Bevel

Bevel cuts back the outer edges of selected faces by one step a press: each edge next to an unselected face turns into a strip (two with Round). Pressing again bevels the new edges, rounding the shape more. The main switch sets the selection mode: Tap faces or Tap a line. Bevel is under Surface on the Build tab.

Select faces on one part, select a Shape, set a Size, and select Bevel. Bevelling the top face of a cube makes four slanted edges; bevelling again rounds those four edges more. After each press, a message confirms the bevel and shows the room left for another press (Bevel applied. Tap Bevel again to round the edge more. or Bevel applied. The faces are too thin to round the edge more.). Every face of a side with holes cut through it bevels into strips round each hole and round the rim.

Tap a line

Tap a line selects edges directly. Tap a line to select it, tap it again to deselect it, and tap more lines to add them. A drag along the fig moves a line with your finger until you lift. Bevel cuts back every selected line at once, and the selection stays on the new strips so you can press again. A tap on an unselected line or on empty space clears the selection; leaving Bevel clears it too. Undo on the Select bar undoes line selections one at a time.

Bevel cuts evenly across matching shapes. Where faces next to each other end at a corner, the gap closes with a four-sided face at the narrow end.

Sharpen

Sharpen turns a bevel back into a hard edge. Select only the beveled strips and select Sharpen; the strips merge into one sharp edge. The unbeveled faces next to them set the edge’s direction.

Shape

• Blocky: One flat strip across each edge.
• Round: A curve of two strips across each edge. At Small, Round has no room to curve and comes out as one flat strip, the same as Blocky; select Medium or Big for a curve (Big in a 32³ fig).

The text below Size describes the result and shows a note when the chosen size makes Round come out as a flat strip.

Size

Select Small, Medium, or Big to set the cut depth per press (default: Small). New corners snap to the fine grid, so the part stays sealed. When Mirror is on, matching faces on the other side bevel at the same time (Tap faces only; a line bevel is not mirrored).

Errors

• Selecting faces on more than one part: Tap faces on one part at a time.
• Selecting every face of a part (leaving no edge to cut): Pick a patch with an edge to cut: the whole part has none.
• A face too thin for even a ⅛-block step (a larger step otherwise shrinks to fit): No step fits there: a face is too thin to cut back (for a line: No step fits there: a face beside that line is too thin to cut back).
• A line without two different faces beside it: Selected line must border two different faces.
• Using Sharpen when no unselected face touches the selection (e.g., the whole part selected): Tap only the beveled faces. The faces beside them set the hard edge.

When a press would break the part (broken edges, overlapping, folded, or zero-size faces, slivers, a new hole), Bevel first tries it once more with the corners beside a sharp face corner slid along that face. If that still breaks the part, the change is undone and leaves nothing in Undo or Redo. The message names the fix:

• One side, or three sides, of a point (e.g., a Pyramid): Action reversed: Bevel can’t cut round a point from just one side. Tap every side, or two sides side by side.
• One line on a shape with a point: Action reversed: on a shape with a point, Bevel can’t cut one line on its own. Tap every line up to the point, or every line round the bottom.
• A line where the face beside it comes to a sharp corner (e.g., a Wedge’s slanted end): Action reversed: the face beside that line has a sharp corner. Tap that face instead. With other lines selected too, it reads Action reversed: the face beside those lines has a sharp corner. Tap that face instead.
• A line that lies flat (a seam between two faces in one plane): Action reversed: that line lies flat, so there is no edge for Bevel to cut.
• One half of a flat face cut corner to corner: Action reversed: that face is half of a flat face split corner to corner. Tap both halves.
• Some of the faces round a hole: Action reversed: Bevel can’t cut just some of the faces round a hole. Tap every face round the hole, or the lines round the hole.
• Part of the way round a round part (e.g., one side face of a Cylinder): Action reversed: on a round part, Bevel can’t stop partway round. Tap the faces or lines all the way round.
• The thin edge of a low Wedge: Action reversed: the edge between the slope and the bottom is too thin to cut. Tap both together. For a tall Wedge the message names the back instead, and for other thin edges it is Action reversed: an edge there is too thin to cut. Tap the two faces on each side of it together. With Round at Medium or Big, these end together, with Blocky.
• At Small, a line beside such a thin edge: Action reversed: at a Small step the cut leaves a face too thin. Try a bigger step.
• Any other break: Action reversed: a bevel here would fold the part. At Medium or Big with Blocky it adds Try a smaller step. With Round at Medium or Big the message is Action reversed: a bevel here would fold the part. Try a smaller step, or Blocky.