Editing parts

Right-click menu

Right-click a part. The menu offers what fits the spot:

On an edge: Round 1 / 2 / 3 mm, Chamfer 1 / 2 mm. The title says whether it's an outside or inside corner and how long the edge is.
On a feature you made here (a counterbore, bearing seat, added block…): Edit or move…, Remove it.
On a hole or rectangular opening: Move or resize… (the whole bore), Resize this wall only…, Fill in, Counterbore it, Countersink it.
On a face: screw hole, counterbore, insert, bearing seat, text or a box cut right there, Fill this opening, or Bridge from this face….
Stretch at this point: along X, Y or Z.
Cut at this point: across Z (at this height), X or Y.
The part: Duplicate, Scale…, Bend…, Cut from another part…, Assemble with another part…, Merge into another part…, Keep only the overlap with…, Make negative / Make positive, Hide, Export this part, Delete.

Right-drag still pans the view; only a right-click without dragging opens the menu.

Round all the edges

Box: Round edges in its panel rounds all twelve edges and corners.
Cylinder: Round rims rounds the top and bottom rims.
Sketch extrusion: Round corners rounds every corner of the outline (the upright edges), Round top / Round bottom the top and bottom edges, or bevels them with Chamfer instead of round. The top and bottom are built from layers 0.1 mm thick or less, finer than a printed layer.
Anything else: right-click an edge to round or chamfer that one edge.

Resize a hole

Click the inside wall of a hole (or right-click › Resize…). Scrawl3d measures it ("Found Ø10.00 × 10.0 mm, through"); type the new diameter and press Enter. Bigger cuts a larger hole on the same axis; smaller fills the old one and cuts the new size. Rectangular openings work the same way: their sizes are named by the world axis they run along (Size X, Size Z …, matching the coloured arrows), and the Found line says which way the opening goes through. The size along that way is its depth: make it bigger to cut on through the next part (it grows evenly at both ends; move it with the arrows to choose where).

Move a hole

Click the hole, then drag the arrows or type X/Y/Z under Placement. The whole bore moves: shaft, counterbore recess and countersink cone together. The old spot is filled in. Shaft Ø changes every diameter of the bore by the same amount. To change just one part of it (say, only the shaft), right-click › Resize this wall only…. Rectangular openings move the same way.

Features you made in Scrawl3d (Features menu, right-click › … here) are recognised: clicking one opens that edit, so moving it moves the whole feature and its sizes stay editable. After a stretch or cut across, earlier features are measured afresh instead (the stretch moved them), so clicking a stretched opening resizes it as it is now.

Resizing and moving work on imported meshes and simple shapes. Library parts have their sizes as parameters instead.

Line up with another hole or point

Under Placement, Line up X / Y / Z:

While moving a hole or other feature: click Y (say), then click the other hole: this one takes its Y, centre to centre. Holes count by their centre.
For a whole part: click the axis, then a point on this part (e.g. its hole), then the point to line it up with. The part moves along that axis only.

Round and chamfer edges

Right-click right on an edge and pick a size; change it later in the inspector (Round ↔ Chamfer, radius). Outside corners are cut away, inside corners filled with a curve. Straight edges and round rims (cylinder tops, hole edges) both work.

Limits: a curved edge must be a full circle; where two rounded edges meet, the corner stays sharp.

Stretch

Right-click › Stretch along X/Y/Z. A green plane shows where the part is cut.

The part is cut there, the far side moves out by the distance, and the gap is filled with the cross-section at the plane. Only that slice grows: the ends and their holes keep their size and just move. A negative distance shortens the part. To make the whole part bigger or smaller, use Scale.

Move the plane with the arrows or Placement X/Y/Z. A plane through a hole turns the hole into a slot, as it physically would.

Scale

Right-click a part › Scale…. Scales the whole part, holes and all, along its own X, Y and Z.

Percent or Size, mm: switch any time; the values convert. In mm you type the size you want, e.g. X 80 makes it 80 mm long.
Uniform (keep proportions), on to start: change any one field and the other two follow. Off: each axis on its own.
The part scales about the middle of its base, so it stays standing where it was.

It is an edit like any other: click it in the history to change it, hide it or remove it. In mm the size is kept even if you later change an edit made before it.

Bend

Right-click › Bend…. Curls the whole part into an arc: Bend is how many degrees of arc along its length (positive: the ends rise, negative: they drop), Cup curls it across. Every point keeps its distance from the middle of the part, so a 2 mm leaf stays 2 mm everywhere and ribs on it follow the curve. Along X / Y picks the direction; it starts along the longer side. The part bends about the plane drawn while editing: move it with Placement.

For a leaf: sketch the outline with a spine and veins as open lines, extrude it 2 mm, then Bend about 40° and Cup about 20°. Print a curved part convex side down, or with supports under the curve.

Cut (at a level)

Right-click › Cut across Z (or X / Y). A green plane shows the cut; set the level with the plane's Z (or X / Y) under Placement, or drag the arrows.

Both halves (default): Apply splits the part in two. This part keeps the lower half and a new part "… (upper)" gets the upper half. Each prints flat on its cut face.
Keep below / Keep above: the other side is removed.

The cut is a normal history step on each half, so you can change it later. Assembly parts (from a drive) can only keep one side.

To stretch at a level, use Stretch along Z and set the plane's Z the same way.

Bridge: fill between two parts

Put two parts (or two faces of one part) with a gap between them, with the faces you want joined facing each other. Right-click the first face › Bridge from this face…, orbit so you can see the second face, and click it. A new part fills the gap: one end is exactly the first face's outline, the other end the second's, and the shape morphs smoothly in between, so a rectangle can flow into a circle, a shifted face skews across, and holes fade in or out. Press Enter to keep it.

Only the flat face you click counts, not the rest of the part in that plane. Both faces can be on the same part, e.g. the two ears of a hinge.
Click flat faces only. A curved face (a fillet where an ear meets the base, a round side) is refused with a message: bridging from one thin facet of it gives a twisted sliver.
It reaches 0.4 mm into each part so everything fuses when printed or exported as one.
The faces must face each other across the gap; if not, Scrawl3d says so instead of guessing.
Sharp corners come out very slightly rounded. If you move either part later, make the bridge again.

Fill an opening, then cut it back in (make it deeper)

Use this like a mould: take the empty space of a hole, pocket or the gap between two ears as a part of its own, reshape it, and cut it back out of the part.

Right-click a wall or the floor inside the opening › Fill this opening. A new part appears, exactly filling the space. It goes as far as the part's outer outline would close it off (as if shrink-wrapped).
Change that new part: move it down to go deeper, Stretch it, Cut it at a level, or Bridge from it to cap it into a new shape.
Right-click it › Cut from another part…, then click the original part. Its shape is cut out where it is now, and it becomes an edit on the original (in the edit list; right-click it to move or remove it). Merge into another part… does the same but adds material: the two become one solid.

Holes that open into the space (e.g. pin holes through the ears) are filled too. If you move the fill, they move with it and become slots. Cut the fill at a level first to leave them out.
Undo brings the fill part back.

Negative parts

Right-click a part › Make negative (or Positive / Negative in its panel). It turns into a red see-through ghost and is cut out of every part it overlaps, live: move, turn, stretch or resize it and the cut follows. It is never printed or exported itself and counts in no volume; the scene list marks it neg. Make positive turns it back into a normal part. Works on imported meshes and on assembly parts too.

Snap (View, or right-click a part › Snap to grid) sets how the arrows move: on, whole millimetres and 15° turns; off, 0.1 mm and 1°. The same switch turns grid snapping off in the sketch.

Ghosts (View, or the N key) hides or shows the ghosts: hidden, they still cut, and you see the finished part. A selected negative part always shows, so pick it in the Scene list to move it. (Hiding one negative part with its eye icon is different: that stops its cut.)

Use it for a cutter you want to keep adjusting; use Cut from another part… when you're done and want the cut baked into one part.

Assemble or merge (as in OrcaSlicer)

Assemble with another part… (right-click a part, then click the other): both stay separate parts but go into one group, so they move together and export as one object. Click the group in the scene list to move the whole assembly. Assembling with a part already in a group adds to that group.
Merge into another part…: makes them one solid (a union). The merged part becomes an edit on the other part; Undo splits them again.
Keep only the overlap with… (an intersection): the part you click keeps only the space both parts fill, e.g. a box and a ball make a rounded cube. Marked ∩ in the edit list.
Parametric assemblies (gearboxes, planetary sets) keep their own parts and can't take others.