Editing operations that used to freeze the window on a many-hole or many-body project — Move Face, Push/Pull, Shell, Draft, Scale Face, Fillet and Chamfer previews, and general viewport re-meshing — now run their heavy work on a background thread and stay responsive while you drag. Opening a large project, hovering over a detailed part, and most sketch edits or menu operations no longer re-tessellate the whole project; several of these measured 90%+ faster. Section View no longer runs a full geometry boolean per plane move, and meshing a body with many small holes is roughly 13x faster. A malformed or truncated STL import no longer silently reports success. An exported STL could fold in on itself near a fillet or fine thread; the underlying mesh-weld pass now checks against real model edges before merging vertices. Sew and Split could each silently drop whole bodies on unusual input instead of failing with an explanation; both now refuse cleanly. Trim and Select+Delete could each corrupt a sketch polygon's bookkeeping, leaving a gap that survived save and undo; both now cascade to the whole polygon correctly. A crash-recovery snapshot from an unrelated, separately-crashed window could overwrite a tab you were actively working in. "Autosave" was a periodic full-fidelity save that could stall the UI for seconds; it's now a single save right before the project closes, including when quitting via the window's close button. Importing a STEP or IGES file could freeze the window for several seconds on a large assembly; import now runs the same background path project load already uses. Idle viewport framerate on a 400+ body project is roughly 50% higher. A spline endpoint placed on a curve, or a loop closed right on its own start point, could save measurably off target under certain settings; both are now exact. Push/Pull could reach past its own guard and target an imported STL mesh body it should have refused. A Fillet or Chamfer could enter a blend that couldn't be cancelled if the radius turned out to be infeasible. Dimension labels can now be dragged to reposition them. Unofficial FreeBSD build support, alongside Linux, Windows and macOS.

Patch fits a single surface across a ring of picked edges. Where those edges bound an opening in a body, the patch is sewn back in and the body closes again; where they don't, it lands as its own surface, which is what you want for bridging geometry. The patch can run tangent or curvature- continuous into the faces the edges came from, and the panel reports the gap and tangency it actually achieved — if the surrounding walls stand square to the opening, no tangent surface exists there and it says so rather than handing you a flat lid labelled tangent. Sew joins loose surfaces into a solid. Select any mix of bodies and it returns either a closed solid or the joined shell plus a count of the edges still open — that count is how many gaps are left to patch. It picks the tightest tolerance that closes rather than the loosest that works, so edges that were meant to stay separate don't get welded together. The result keeps the first selected body's name, colour and folder. Remove Feature is the tool that used to be called Repair Geometry. It never was a general fixer: it deletes the picked face and heals the neighbours over the gap, which is how you take a baked fillet or chamfer back to a sharp edge. The new name is what it does, and it's the History label too. Translated in all five languages. Merge Faces joins the group instead of sitting at the end of the catalogue.

Sketching Arcs take typed dimensions like circles and rectangles: type the chord, then a swept angle (180 = semicircle) or a radius — Degrees/Radius toggle in the input dialog, minimum radius shown and enforced. The cursor still picks which way the arc bows. Drawing guides now work in every tool — arcs, two-point circles, polygons and splines get the angle snap, tangent, perpendicular/parallel and alignment guides that lines always had, measured from the point being placed. Tangents work from the curve itself: start a line on a circle and draw off tangentially, or continue tangent from an arc's end. Splines can be tangent references; arcs honour their real span; with several curves in range, the guide picks the one you're aiming at. The sketch grid on round faces lines up with the world. A keyway flat or slot side no longer rotates the grid on a face that's circles by any sane reading. Modeling (community + fixes) Loft: tip-split sampling, faces as sections, bridging into the host body. Extrude/boolean operations are time-boxed — pathological cases cancel instead of hanging. STL export welds and repairs the mesh so slicers stop rejecting prints. Merge Faces: linear tolerance added, and refusals now say why. Lay Flat on Plane from a right-clicked planar face, and for sketches. A union that comes back smaller than its largest input is rejected as the data loss it is; Union/Intersect failures show a message instead of silently doing nothing.

High-DPI Linux is detected, not configured. The interface scale used to be a manual Low/High setting with a first-run prompt. It is now measured from the display, so the app comes up the right size on a HiDPI laptop with nothing to set. The mouse cursor and the initial window size follow the same scale, so the pointer is no longer a speck and the toolbars are no longer jammed against the viewport. --ui-scale still overrides it if you want a specific number. Interface elements scale with it. Buttons across the dialogs sized themselves in fixed pixels while their text grew with the interface scale, so labels ran past their own edges at 2x. The ViewCube, its rotation arrows, the Home button, the axis triad and the snap widget had the same problem in reverse — they stayed small while everything around them grew. All of them now follow the interface scale. The app lets your screen sleep. Materializr was holding the display awake for as long as it was open, which on a laptop meant a flat battery instead of a suspended machine. It now idles out like any other application.

Move a hole. Select a hole's rim edge and drag: one rim tilts the bore, one straight side reshapes it, both rims slide the whole hole across the face it pierces. Clicking the bore wall itself also offers Move, for the slide-the-whole-hole case. The selection picks the verb, and the drag previews the verb it will commit. Push / Pull and Extrude are both offered for a sketch, whichever it is attached to. A sketch drawn on a face used to offer only Push — exactly when "make this a separate body instead of fusing it" is what you want. Attachment now picks the ORDER of the two, not which one exists. Lathe on a selected sketch in the classic layout. It had always been there in the modern and im-touch rails. Merge Faces, for the seam lines that run across an otherwise flat face on an imported STEP part — which also confuse Unfold and sketch-on-face, because what looks like one panel is several faces. Two ways in, and they try different amounts. Select a body and it merges only what is exactly coplanar, which is safe to point at a whole part but leaves the near-miss seams alone. Select two or more faces and it merges just those, and because you have said which faces are one it can accept planes that are a fraction of a degree apart. Either way the result is checked for validity and for volume before it is kept, so a merge that would reshape the part is refused rather than applied. New parts should not need it: the modelling ops no longer leave these seams behind in the first place.

Tabbed workspaces: several projects open at once, each with its own history, camera and crash recovery. Ctrl+Tab switches; the "+" button offers New / Open / Open Recent; closing the last tab returns to the home screen. Tabs appear in all three layouts. Home screen with project thumbnails: recent projects show a rendered preview of the model instead of a filename. Project files carry the thumbnail with them, and parts from another project can be opened alongside what you already have. Multi-start threads: interleaved helixes, bottle-cap style, with a stepped Starts field and a depth cap that matches what actually gets cut. Groove width is now set explicitly instead of being derived from the pitch. Number pad for touch: numeric fields unfold a pad in place — digits, sign, decimal, backspace and Enter — across every numeric field in the app. It follows the Touch mode setting, so a device with a keyboard keeps using the keyboard. Export any format per body, and export a multi-selection: the viewport's body menu and the Items panel both offer the full format list. Ctrl+click in the Items panel extends a selection across types.

Materializr 1.5.1 adds a sketch Dimension tool — Onshape-style measurements and driving dimensions from the D key or the sketch toolbar. Threads get four new profiles (trapezoidal/ACME, square, buttress, rounded) plus a fit-clearance option for printed bolt+nut pairs, and now thread correctly through end chamfers and onto joined bodies.

Features: File exchange, wholesale — BREP import/export, OBJ + 3MF export, sketch → DXF export, and DXF import that stamps laser/CNC profiles straight into a sketch. IGES now applies the Y-up/Z-up conversion. Project files prefer the shorter .mzr extension (.materializr still opens). Reference images — drop a picture into the viewport and model against it. New modeling ops — Guided Loft (loft steered by guide curves), N-section loft, Boundary Fill, and Separate (split a body's disconnected solids into individual bodies). Chamfer/fillet, rebuilt — true corner miters and hips, and a cut-based fallback that rescues blends OpenCASCADE's native builder refuses (holes/pockets crossing the edge). Face-lineage topological naming keeps bevel identity stable through booleans, reloads and history edits. History that follows — extrude remembers its regions, the cascade disables steps that can't follow instead of reverting everything, and hovering a history step highlights its geometry. Desktop QoL — Linux HiDPI interface scale, click-drag line tool, movable operation panels, Push/Pull gated off curved faces Fixes: macOS startup crash on macOS 26.x — the bundled SDL2 is now source-built against a current SDK with a macOS 14.0 floor Audit hardening — op results validity-gated before commit, SVG import budgets, settings clamping + .cfg injection fix, transactional project load Shell honestly refuses fillet-ringed faces it can't hollow; stepped-hole sketches no longer extrude a floating plug Recovery autosave debounces on quiescence; two-finger touch gestures no longer click through (im-touch)

Rolls up the whole 1.4.x line. Highlights since 1.3.0: One OpenCASCADE kernel everywhere (7.9.3) — desktop, Windows, macOS and Android on the same kernel for consistent boolean/fillet behaviour. Section View cross-section cap — clipped bodies render solid at the cut plane. Per-ABI Android packaging — separate arm64-v8a and x86_64 APKs. Touch (im-touch) polish — unified movable operation popups (drag by a slim grip), tap-to-raise soft keyboard, and Push/Pull-vs-Extrude gated by sketch attachment. Fixed: Duplicated sketches are now independent of the original's body Soft keyboard appears on tapping Push/Pull / Extrude / Fillet value fields Snap to grid honored by Extrude, Push/Pull and Move Face macOS file-dialog detection; body z-fighting; sketch/history reload fixes