Free Engineering & 3D Design Tools — Mould Builder, STL Generator, Piping & CAD

Featured Free Engineering & 3D Design Tools

• Free 3D Mould Builder — Online Injection Mould Designer
  Design 3D injection mould cavities step by step. Add geometry, define parting lines, export STL/OBJ. Best for product designers and engineers building prototype moulds without CAD licences. Open 3D Mould Builder →
• Free 3D Revolve STL Generator — Solid of Revolution Tool
  Enter a 2D profile function and revolve it into a 3D solid. Create vases, bowls, columns, and cylindrical parts, then export STL for 3D printing. Best for makers and engineering students. Open 3D Revolve Generator →
• Free 3D Surface Plane Plot Generator — Math Function Visualizer
  Type any f(x,y) formula and render a 3D surface mesh instantly. Choose from 40+ presets or write custom equations. Export STL/OBJ/GLB. Best for students, educators, and 3D artists. Open 3D Surface Plotter →
• Free Browser CAD Frame Builder — Full 3D Design Suite
  A complete browser-based 3D CAD environment powered by Babylon.js. Model, assemble structural frames, and export designs without installing any software. Best for engineers and designers who need a free browser CAD tool. Open Browser CAD Frame Builder →
• Free 3D Isometric Painter — Isometric Design Tool — Paint and design in 3D isometric perspective, no CAD required
• Free 3D Conveyor Designer — Conveyor System Layout Tool — Design conveyor system routes and configurations in 3D
• Free 3D Hinge Generator — Mechanical Hinge Design Tool — Generate configurable hinge geometry for mechanical assemblies
• Free 3D Road Generator — Infrastructure Path Design Tool — Design road layouts, paths, and infrastructure routes in 3D
• Free Piping Layout Designer — P&ID Sketch Tool — Plan pipe routes, connections, and piping layouts in your browser
• Free Junction Box Designer — Electrical Box Sizing Tool — Calculate junction box sizing and configure internal layouts to code
• Free Arc Flash Safety Calculator — Incident Energy & PPE Tool — Calculate arc flash incident energy and required PPE level for electrical safety compliance
• Free 3D Parametric Plotter — 3D Scatter & Line Plot Tool — Plot parametric 3D data as interactive scatter plots and surface meshes
• Free 3D Primitive Builder — Cube, Cylinder & Rod Designer — Model and combine basic 3D primitives for engineering sketches
• Free 3D Tray Builder — Custom Tray & Box Designer — Design custom tray shapes and enclosures, export STL for 3D printing
• Free 3D CSG Modeller — Boolean Shape Operations Tool — Combine and subtract 3D shapes using boolean CSG operations in the browser

Full List — All Free Engineering & 3D Design Tools

• 2Dto3D Voxel — Free online voxel modeler with a mobile-first UI
• 3DConveryor — Design and preview modular 3D conveyor systems with configurable segments, turns, and materials
• 3DHandgen — Free online 3D tool to create custom 3D hand poses
• 3DHingeGen — Design custom 3D hinges online
• 3DMarbel — Free online 3D tool to design custom printable marble runs with continuous slopes, spiral helixes, c
• 3DPlaneplot — Generate deformable 3D planes from math functions
• 3DRevolve — Create 3D solids of revolution by defining a 2D profile function
• 3DText — Free online 3D tool to create custom 3D text models
• 3DTray — Create custom 3D component trays and organizers online
• 3D Iso Painter — Create isometric pixel art and 3D scenes online
• 3Dart — Create stunning 3D generative wall art with customizable panels, colors, and styles
• 3Dmould Builder — Design custom 3D injection moulds step by step
• 3Dplanerplot — Generate and deform 3D planes using math functions
• 3Droadgen — Draw custom road paths on a 2D canvas and instantly preview them as a 3D road with curbs and texture
• 3Dsite Tunnel — Explore an immersive 3D underground expedition with glowing crystal caverns, mining shafts, and lava
• 3DthreeDplot — Plot and visualize 3D volumetric math functions in your browser
• 3DwCSG — Boolean 3D modeling with CSG in your browser
• 3dWall — Design and generate 3D wall sections with customizable dimensions and patterns
• Arc Flash Calc Test — Start by adding a source component
• BoxCustom1 — Design and export custom multi-part 3D printable boxes
• BoxCustom2 — Design and export custom 3D printable boxes
• CastleCustomizer — Free online 3D tool to create custom castle models with towers, keep, moat, crenellations, wall walk
• Create3DWorlds App — A browser-based 3D world creator and modeler
• CubeCylnRod — Use this free online 3D primitive builder to arrange cubes, cylinders, and tubes, lock positions, an
• Draw3DSpace Mobile — Mobile-friendly voxel modeler with focused 3D view and 2D drawing canvas
• ELEClayoutv3D Test — Design and visualize electrical panel layouts in 3D with gizmo transform controls
• ElecDrafting2 — A utility application called ElecDrafting2
• House Customizer — Free online 3D tool to create simple custom dollhouse models
• HumanBodyCustomizer — Free online 3D tool to create simple posable human forms
• JunctionBoxAdv — Design and build custom 3D enclosures online
• LegotCustomizer — Free online 3D tool to create 9 types of custom Lgots Technic compatible parts: Beams, Axles, Pegs,
• MoneyBankCustomizer — Simple online 3D tool to assemble predefined objects (gear, rod, cube, etc
• OrnateCustomizer — Design custom right-angle plates with various embellishments (Sphere, Cone, Octagon, etc
• PIDController — Explore PID control with an interactive simulation
• PipingDesigner — Konva
• PlanterCustomizer — Free online 3D tool to create custom planter boxes / raised garden beds with separate parts
• Pumbingcost3D Test — Plan and visualize piping and plumbing systems in 3D
• RobotServo — Control a 3D simulated 4-DOF robot arm with servo motors in your browser
• SimpeElecCECCheck — A utility application called SimpeElecCECCheck
• TableCustomizer — Free online 3D tool to create custom workbenches or desks with separate parts
• ToothTray — Free online 3D tool to design custom toothbrush holders
• Trace2Dto3Dprint — A utility application called Trace2Dto3Dprint
• Ultimate 3D 2 — Build 3D voxel models by drawing 2D shapes that are extruded into 3D
• VRTrainElec — A free, browser-based 3D training simulator for electricians
• VRTrainFacility — A utility application called VRTrainFacility
• VRTrainHDm — Train for gas fitting with a free browser-based 3D simulator covering gas leaks, LOTO, and valve shu
• VRTrainSalon — A utility application called VRTrainSalon
• XRdesign — WASD to Move | Click to Act | ESC to Exit
• Cylid Holes Spacer — Free online 3D tool to create custom spacers, cylinders, or tubes with configurable through-holes
• Glb Viewer Tool — A utility application called Glb Viewer Tool
• Glb2objstltool — A utility application called Glb2objstltool
• Mechgear — A utility application called Mechgear
• Paint2 3D — Convert any image into a 3D height-map model right in your browser
• Svgto3D — Free browser-based 3D editor to convert SVG files into extruded 3D models
• Vitch 3D Printer2 — Simulate and plan 3D model placement on a virtual print bed

Browse Other Free App Categories

• Free Business & Management Apps — Invoice generator, FMEA tool, finance planner, inventory, booking, and RCA tools
• Free Engineering & 3D Design Tools — 3D mould builder, STL generator, piping designer, junction box, arc flash calculator
• Free Reliability & Maintenance Tools — FMEA, 5 Whys, root cause analysis, benefit-effort matrix, capacity planning
• Free Web Utilities — Calculators, mortgage tool, budget planner, timers, and converters
• Free Media & Art Tools — Painting, audio visualiser, GIF creator, video frame editor
• Free Education & Learning Apps — Interactive simulations, science tools, and learning utilities
• Free Browser Games — Play Instantly — 40+ action, strategy, simulation, and trades-themed games

Need a Custom Tool Built for Your Business?

SolvProb builds custom web apps, business tools, and automation systems for small businesses and industrial companies across British Columbia. Every free tool in this gallery was built by the same engineers who build paid custom software.