layerling 1.154.0

• Take buttons you never use out of the ribbon (Discussion #1519, #1087, #1051, #447, #695, #1502): Settings, Appearance, Buttons in the ribbon lists every group of the 3D ribbon with its buttons. A tick takes one button out, Show this group a whole group, and Show all brings everything back. What is taken out only leaves the ribbon: the command search (Ctrl+K) and your own keys still run it, and the order of the groups stays the same, so the guide and the help keep pointing at the same places. A group with no button left disappears and the rest of the ribbon moves up, so fewer groups fold. The Shapes group and Help always stay. The choice is kept in the browser and goes into the settings file.

• Screw and bayonet caps with a rounded or chamfered top edge (Discussion #1426): A screw lid printed top down could not get a rounded rim: cap and thread are one mesh of about 29,000 triangles, and the edge tool stops at 4,000. The lid window now has Top edge for screw and bayonet caps: Rounded or Chamfer, with Edge size (1 mm to begin with, at most the plate's thickness), made with the cap. The cap prints turned over, so this edge lies on the bed. layerling_make_lid takes topEdge and topEdgeSize. Asked for by @3wheeltom.

• Smoother revolved bodies (Discussion #1426): An exact revolved sketch body was always cut into facets within 0.05 mm and about 9 degrees, and on a large pot they showed on the print. A revolved body now has Smoothness in its properties: Fine (0.02 mm, 4.6 degrees) and Extra fine (0.01 mm, 2.3 degrees) cut the round faces finer, at the cost of more triangles. A helix or an older mesh revolve keeps Sides for this. layerling_update_object takes revolveSmoothness. Asked for by @3wheeltom.

• Imported files land on the plate you are on (Discussion #1514): With several build plates, a new shape from the library already landed in the middle of the active plate, but an imported STL, OBJ, 3MF, STEP, SVG or DXF always came in on the first one. Now an import lands on the active plate, its parts keeping their places to each other, and so does a custom shape inserted without click to place.

• Shrinking or hollowing a body with rounded edges no longer makes a broken body (Issue #1521): An enclosure rounded by 1 mm, shrunk by 2 mm with Offset and used as a hole to hollow it, could not be grouped: "This mesh is not closed ... openings left: 3". A rounded edge narrower than the distance shrinks to nothing, and the CAD kernel then handed back loose faces that no longer met, or a body shrunk by half the distance with its roundings turned inside out, and layerling took either for the offset. Offset now takes only a closed body that has moved in or out by the whole distance, and shrinks such a body as if those edges were sharp, which is what they become that far inside. Hollow builds its cavity the same way, so the same enclosure can also be hollowed in one step, closed or open at the bottom, with its rounded outside kept. Reported by @foofoodog.

• Imported STL parts open as they were saved again (Issue #1518): A design keeps every imported STL as the file itself and reads it again when it opens. Since 1.151.0 every STL is read Z-up (Discussion #1450); before, a file that was thin in Y was taken for Y-up. Parts imported that way opened turned by 90 degrees and stretched to their old size, in every design that held one. A design now reads such a part the way it was imported, also when it was saved again after opening wrongly; parts imported since 1.151.0 stay as they are. Reported by @voltage3d.