Cut

Cut places a cut line on a part to change its shape. It has three modes: Slice adds a ring and removes nothing, Chop removes one side of the part along the cut line, and Wedge removes a wedge through the part’s middle. Cut is on the Build tab.

Tap the part to place the cut line, or drag to move it. The preview line snaps to the grid. Selecting another tool or tab closes Cut without changing the part.

Slice

Slice adds a closed ring along the preview line. If a ring is already at that spot, the preview line snaps to a free half-block line next to it. Select Cut. Slice stays open with a new preview line, and the new ring stays selected. Switching tabs clears ring selections; to select the ring again in Adjust , set Pick to Rings and select its line. Opening another Build tool after a Slice starts with no faces selected.

The second switch sets the cut’s direction:

• Across: A level ring around the part.
• Side and Front: Upright rings facing the side or the front.
• Middle: Only for parts that are round seen from above (cylinders, spheres, donuts). The cut line goes through the part’s middle. Drag on the part to turn the line in 15° steps. Middle stays on after a Cut, and the line turns to the next free line through the middle (halfway across the widest gap between the lines already there), so pressing Cut again makes the next cut. If you drag the line onto one already cut, Cut shows Line already cut. Drag on the part to turn the line, then Cut.

Follow sets the directions the cut follows. Part (on at the start) follows the part’s own directions, so on a turned part Across goes around the part as it is turned, and Side and Front face the part’s own side and front. The line steps in whole and half blocks from the part’s own end, and Middle turns about the part’s own Across direction. World follows the grid: Across stays level with the floor. On a part that isn’t turned, or is turned in quarter turns, both cut the same way. Chop has the same row, and the two rows share one setting.

Across is on at the start. Spheres have only Across and Middle. Only Middle cuts through the middle: on round parts too, Side and Front stay straight lines where you tap or drag. When Mirror is on, a Slice is mirrored across the middle of the part; Chop and Wedge are not.

Chop

Chop cuts the part along the cut line and removes the side you don’t keep. The open cut seals flat so the part stays solid.

1. Tap the part to place the cut line. The side to be removed shows faded and grey. Drag to move it.
2. Set the direction: Across, Side, or Front (spheres have Across only).
3. Set Keep to the side you keep. The options change with the direction: Top or Bottom (Across), Left or Right (Side), Front or Back (Front). Selecting Both keeps both halves as separate parts. Bottom is on at the start.
4. Select Chop.

Chop stays open, with a new preview line on the remaining part.

Wedge

Wedge removes a wedge from a cylinder, sphere, or box. The preview line goes through the part’s middle; tap the part to point the line at that spot, or drag to turn it in 15° steps. Select a wedge size, then select Take wedge:

• Thin: a 30° wedge.
• Medium: a 45° wedge (default).
• Quarter: a 90° wedge.

The open cut faces seal flat so the part stays solid. Wedge stays open with a new preview line. Switching to Slice or Chop restores the usual straight preview lines.

The new flat faces inside are ordinary faces: color them with Fill , or push them in with Push in .