Free Engineering & 3D Design Tools — Mould Builder, STL Generator, Piping & CAD
SolvProb builds free browser-based 3D engineering tools for product designers, mechanical engineers, electricians, and makers. Design injection moulds, generate STL files for 3D printing, plot 3D math surfaces, build piping layouts, and size junction boxes — all without expensive CAD software like SolidWorks or AutoCAD.
Featured Free Engineering & 3D Design Tools
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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 →
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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 →
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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 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
- 3DsiteModern — Explore an immersive 3D portfolio for artists and gamers built with Three
- 2Dto3D Voxel — Free online voxel modeler with a mobile-first UI
- 3DCadDesigner — Boolean 3D modeling with CSG in your browser
- 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 — Design parametric 3D marble runs with helix, wave, or zig-zag layouts, live roll simulation, support
- 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 — Organize an electrical arc-flash study tree with sources, buses, loads, equipment inputs, illustrati
- 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 — Assemble cubes, rods, and tubes in a live 3D scene, edit transforms and colors, lock objects, and ex
- 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 — Browser electrical and P&ID drafting canvas with symbols, annotations, title blocks, PNG export,
- House Customizer — Create a parametric dollhouse model with dimensions, gable or flat roof settings, colors, chimney, a
- HumanBodyCustomizer — Create a customizable 3D human figure with body proportions, colors, joint angles, and OBJ or GLB ex
- JunctionBoxAdv — Design 3D enclosures with adjustable dimensions, movable parts, and STL, OBJ, or GLB export for fabr
- LegotCustomizer — Create customizable Technic-style 3D parts—beams, axles, gears, bricks, pegs, bushings, and more—and
- MoneyBankCustomizer — Assemble Three
- OrnateCustomizer — Generate a customizable right-angle plate with repeated 3D embellishments, set dimensions, color and
- PIDController — Tune Kp, Ki and Kd in a browser-based PID simulation with adjustable setpoint, gain, loss and noise,
- PipingDesigner — Draw multi-section pipe paths with snap-to-grid, diameter, wall thickness, hollow, and color control
- PlanterCustomizer — Design a raised planter box in 3D by setting length, width, board height, layers, thickness and post
- Pumbingcost3D Test — Plan and visualize piping and plumbing systems in 3D
- RecycleScan 3D Recycling Counter — Explore a portable Jetson recycling counter concept with synthetic 3D scans, battery and camera cove
- RobotServo — Explore a browser-based 4-DOF robot-arm simulation: move four 0–180° joints, inspect mapped PWM valu
- SimpeElecCECCheck — Estimate transformer loads, conductor ampacity, voltage drop, and simplified CEC compliance results
- SmelterWorks 3D — Offline-capable 3D aluminium smelter process simulator with editable assumptions, production and ene
- 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 — Trace3D Pro is a browser drafting tool for tracing 2D references, solid or hollow extrusions, 3D pre
- Ultimate 3D 2 — Build 3D voxel models by drawing 2D shapes that are extruded into 3D
- VRTrainElec — Practice an electrician lockout/tagout sequence with PPE, disconnect, lock/tag, zero-energy multimet
- VRTrainFacility — Practice a six-step facility maintenance scenario in WebXR, including PPE, fault inspection, isolati
- VRTrainHDm — Practice gas-fitting safety with PPE, leak detection, valve shutoff, lockout/tagout, and leak repair
- VRTrainSalon — Practice a six-step salon service scenario in WebXR, from hand sanitation and consultation through d
- XRdesign — Browser-based 3D scene builder for spawning, moving, painting, and deleting objects with desktop FPS
- Cylid Holes Spacer — Free online 3D tool to create custom spacers, cylinders, or tubes with configurable through-holes
- Glb Viewer Tool — GLB scene editor for loading GLB/GLTF models, adjusting transforms, applying Smooth or Melt, replaci
- Glb2objstltool — Browser GLB converter that previews local
- Mechgear — Design 3D gears in your browser by tuning teeth, pitch, face width, bore, taper, and color, then exp
- 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