Simply3D v0.4.2

Sketch your own parts: draw flat shapes, then extrude or revolve them into solids.

What's new

• Sketch (K, or Insert ▸ Draw ▸ Sketch): draw rectangles (rounded corners or slots), circles, polygons and outlines with straight and curved segments, on the plate or on any face of an object.
  • Grid snapping, snapping to corners and centres of other shapes, and exact sizes for the selected shape in the bottom bar.
  • Shapes drawn inside another become holes; overlapping shapes merge.
  • Extrude into a new part, onto the object you drew on, or cut into it (optionally all the way through). Revolve into an upright part — vases, knobs, wheels.
  • Live 3D preview, its own undo while sketching, and Last sketch brings back the sketch you just used.
• Update check: Simply3D looks for a newer release once a day (turn it off in Settings) and shows a button with what's new when there is one. Help ▸ Updates checks right away.
• Extrude down works on threaded parts: bolts, nuts and threaded rods can now be extruded down to the plate without errors.

Download

• Windows: Simply3D-windows-x64.zip — unzip and run simply3d.exe (64-bit Windows 10/11).
• Linux: Simply3D-linux-x64.tar.gz — unpack and run ./simply3d, or ./install.sh to add it to your applications menu.

Simply3D v0.4.1

The ribbon now fits any window size, the way Microsoft Office does.

What's new

• Ribbon fits narrow windows: as the window gets narrower, groups shrink one at a time from the right — first to small icons with labels (three to a column), then to icons only (the name shows when you hover). Past that, the ribbon scrolls. Group captions always stay on one line.
• Top row makes room too: the search box turns into a search icon, then the app name, logo and save icon step aside, and Print shows just its icon.
• Works down to about half a laptop screen without anything overlapping.

Download

• Windows: Simply3D-windows-x64.zip — unzip and run simply3d.exe (64-bit Windows 10/11).
• Linux: Simply3D-linux-x64.tar.gz — unpack and run ./simply3d, or ./install.sh to add it to your applications menu.

Simply3D v0.4.0

A design pass: everything has one home, results tell you what happened (with Undo), and a new Print step takes your plate straight to your slicer.

What's new

• Print (Ctrl+P, top right): pick your printer, then a checklist catches what would go wrong (parts off or below the plate, too big for the printer, open meshes, overhangs that need supports, thin walls), each with a one-click fix. Then open the plate in your slicer: Simply3D finds Bambu Studio, OrcaSlicer, ElegooSlicer, PrusaSlicer, UltiMaker Cura, Creality Print and others, or uses the app your computer opens 3MF files with. Or save 3MF, STL, OBJ or PLY.
• Printer presets: Bambu Lab, Elegoo, Prusa, Creality, Anycubic and Voron, setting the plate size and build height.
• Settings in the bar under the view: every tool you start from the ribbon (Simplify, Smooth, Round edges, Extrude down, Hollow, Make solid, Pattern, Cut, Picture, Array) shows its settings right there, with a live preview. No need for the side panel.
• Array is a tool of its own (Object tab), with an outline of where each copy will go.
• Notices in the corner of the view say what just happened, with Undo right there.
• Undo history: the arrow next to Undo lists your last steps; jump back to before any of them.

Easier to use

• The side panel shows what's selected: its settings, position and size, and its health.
• Ribbon: Edit is Combine / Cut / Shape / Fix; Surface (was Paint) has Paint, Faces, Texture and Sculpt.
• One name per action everywhere: Merge, Combine, Separate, Extrude down, Round edges, Bake, Drop to plate, Centre on plate.
• Tooltips show each button's key; ? or F1 lists every shortcut.
• A blue frame around the view while a tool is active.
• Clearer text, a lighter selection in the object list.
• Tools that keep their options in the side panel open it while they run and close it after.

Download

• Windows: Simply3D-windows-x64.zip — unzip and run simply3d.exe (64-bit Windows 10/11).
• Linux: Simply3D-linux-x64.tar.gz — unpack and run ./simply3d, or ./install.sh to add it to your applications menu.

Simply3D v0.3.3

What's new

• Linux download: Simply3D-linux-x64.tar.gz. Unpack it and run ./simply3d, or ./install.sh to add Simply3D to your applications menu with its icon (no root needed; ./install.sh --uninstall removes it). Runs on Ubuntu 22.04+, Debian 12+, Fedora 36+, Mint 21+, Arch and others, on Wayland or X11, with a Vulkan graphics driver.
• Building from source on Linux is now one command: ./build.sh. The README has the steps for each distro.

Download

• Windows: Simply3D-windows-x64.zip. Unzip it and run simply3d.exe (64-bit Windows 10/11).
• Linux: Simply3D-linux-x64.tar.gz (see above).

Simply3D v0.3.2

What's new

• Printable threads: a new "Printable 45°" thread profile prints with no overhangs or supports, either way up. Use it for printed parts that screw together.
• Settings in the bottom bar: Simplify, Smooth, Round, Extrude down, Hollow, Make solid, Pattern and Cut now show their settings right in the preview bar under the view. No need to open the side panel.
• Drop shapes in the middle: while placing a new shape, press C or click "Plate centre"; or use "Add at plate centre" in the add window. Settings → New shapes can make it the default.

Fixes

• Cutting after extruding faces of an imported model no longer fails with "invalid mesh".
• Repair now removes hidden inner walls, so models that other apps flag as broken get fixed.
• Lay flat and Measure switch off again when you click them on the ribbon (or press their key). Lay flat finishes after one face; hold Shift to lay more.
• The ribbon's "Apply" is now "Bake". It's only enabled when there's rotation or scale to build into the shape, and it says what it did.

Smaller changes

• The start screen is simpler: Open a model or Empty plate (which opens the Insert tab).

Download

Simply3D-windows-x64.zip holds a single portable simply3d.exe for 64-bit Windows 10/11. Unzip it and run it.

Simply3D v0.3.0

What's new

• Edit generated parts later: select a gear, bolt, box, bin or brick and change its settings in the side panel; it rebuilds in place. Settings are saved in 3MF projects.
  -Simply3D 0.3.0Print check (View tab): highlights overhangs, thin walls and islands before you slice, with your own overhang angle and minimum wall.
• Circular array: copies around a centre, with a live preview.
• Split to fit the printer: cuts models that are too big into pieces that fit, with pegs or dowels.
• Printer presets now include build height.

Simply3D 0.2.0.

What's new

Custom threads. Bolts, nuts, rods, tubes and tapped holes are now fully customisable:

• Standard metric (M2–M24) and inch UNC (#4-40 to 1/2"-13) sizes, or any diameter and pitch
• Profiles: 60° V, trapezoidal, square, buttress and rounded (bottles, jars)
• Custom thread depth, multi-start threads, left-hand threads
• Bolt heads: hex, socket, countersunk, round, knurled (thumb screw) or none; optional plain shank; hollow bolts
• Nuts: hex, square, round or knurled; closed-top caps
• New presets: screw-on jar lid and matching threaded neck

Download

Simply3D-windows-x64.zip below holds a single portable simply3d.exe for 64-bit Windows 10/11: unzip and run, nothing to install. Windows SmartScreen may warn about a new unsigned app: choose "More info → Run anyway".

Simply3D 0.1.0

Simply3D is a free, fast 3D modelling app for 3D printing. It's a remake of Microsoft 3D Builder in Rust, with the same simple tab-and-ribbon way of working, plus the precision, repair, painting and sculpting tools 3D Builder never had.

Download

Simply3D-windows-x64.zip below holds a single portable simply3d.exe for 64-bit Windows 10/11. There's nothing to install: unzip it and run it. Open models by dragging STL, OBJ, PLY, 3MF or picture files onto the window.

What it does

• Files: opens and saves STL, OBJ, PLY and 3MF, including Bambu Studio, OrcaSlicer and PrusaSlicer projects with their colours, painted areas, negative parts and thumbnails.
• Shapes: cubes, cylinders, spheres and more, with exact rounded or chamfered edges. Also text from any installed font, and pictures turned into 3D (outline, height map, stamp, lithophane).
• Parts: ISO metric bolts, nuts, threaded rods and holes; gears, springs, print-in-place hinges and snap-fit clips.
• Storage and toys: boxes with slide, snap or hinged lids; modular grid storage bins and baseplates; building bricks, plates and tiles in two sizes, with fit settings to tune for your printer.
• Precise editing: move, rotate and scale by mouse or exact numbers (type a distance while dragging, or nudge with the arrow keys), snapping, align, distribute, auto-arrange and auto-orient. Measure distances, angles and holes.
• Combine and cut: union, subtract and intersect with a robust boolean engine. Use any object as a live hole. Cut with a plane, with optional pegs or dowels so the halves fit back together.
• Mesh tools: repair, make solid, simplify, smooth, round edges, hollow, extrude, Voronoi/gyroid patterns, surface textures (knurl, wood, carbon fibre or your own picture), and face selection with extrude, flatten and separate.
• Paint and sculpt: paint colours for multi-material printing (saved for Bambu, Orca and Prusa), and sculpt with draw, inflate, smooth, flatten and grab brushes.
• Comfortable on big models: fast picking, painting and sculpting on multi-million-triangle meshes. Smooth shading, wireframe, section view, X-ray, undo/redo, autosave with crash recovery, and command search (Ctrl+K).

Build it yourself

Install Rust from https://rustup.rs and run build.bat.

Notes

• This is the first public release; please report problems under Issues.
• Licensed under the GNU GPL v3.0 or later. Icons are from Lucide (ISC).
• Microsoft 3D Builder is a trademark of Microsoft. Simply3D is an independent project and isn't affiliated with or endorsed by Microsoft.