How to make 3D models: 4 ways for beginners
There are four ways to make a 3D model. You can model or sculpt it by hand in a 3D app such as Blender, design it with exact measurements in CAD (Tinkercad, Fusion, Onshape or FreeCAD), scan a real object from photos, or generate it with AI from a text prompt or a picture. AI is the fastest way to a first model, Blender gives you the most creative control, CAD is best for parts that must fit, and scanning copies something that already exists.
The 4 ways compared
- Model or sculpt in Blender
- Skill needed:
- Highest: the interface, shortcuts and clean topology take practice
- Time to a first model:
- A simple shape in your first session; detailed models take much longer
- Best for:
- Characters, creatures, game props, art
- Cost:
- Free (open source, GPL)
- Design in CAD
- Skill needed:
- Medium: sketches and exact dimensions (Tinkercad is drag-and-drop)
- Time to a first model:
- A simple part in your first session with Tinkercad
- Best for:
- Printable parts, enclosures, anything that must fit
- Cost:
- Tinkercad and FreeCAD: free. Fusion: free for personal, non-commercial use, with limits. Onshape: free plan for public, non-commercial designs
- Scan with photos
- Skill needed:
- Low to medium: careful, overlapping photos
- Time to a first model:
- One photo session plus processing, then clean-up
- Best for:
- Copying an object that already exists
- Cost:
- RealityScan: free for individuals and companies under $1M a year in revenue. Other apps vary
- Generate with AI
- Skill needed:
- Lowest: a prompt or one photo
- Time to a first model:
- About 1 to 3 minutes per model on The3DAI
- Best for:
- Fast concepts, props, figurines, a starting point to edit or print
- Cost:
- The3DAI: 15 credits (text) or 20 credits (image) per model; new accounts get free starter credits
| Route | Skill needed | Time to a first model | Best for | Cost |
|---|---|---|---|---|
| Model or sculpt in Blender | Highest: the interface, shortcuts and clean topology take practice | A simple shape in your first session; detailed models take much longer | Characters, creatures, game props, art | Free (open source, GPL) |
| Design in CAD | Medium: sketches and exact dimensions (Tinkercad is drag-and-drop) | A simple part in your first session with Tinkercad | Printable parts, enclosures, anything that must fit | Tinkercad and FreeCAD: free. Fusion: free for personal, non-commercial use, with limits. Onshape: free plan for public, non-commercial designs |
| Scan with photos | Low to medium: careful, overlapping photos | One photo session plus processing, then clean-up | Copying an object that already exists | RealityScan: free for individuals and companies under $1M a year in revenue. Other apps vary |
| Generate with AI | Lowest: a prompt or one photo | About 1 to 3 minutes per model on The3DAI | Fast concepts, props, figurines, a starting point to edit or print | The3DAI: 15 credits (text) or 20 credits (image) per model; new accounts get free starter credits |
Prices and plans of other apps as published on their sites in October 2026; check before you rely on them.
1Model or sculpt it in Blender (free)
Blender is free and open source, and it does everything from modelling and sculpting to UVs, textures and rendering. Most artists combine two techniques: box modelling (start from a cube and shape it by adding edges and pulling faces) and sculpting (push and pull a dense mesh like digital clay).
1.Install Blender and open a General scene
Download Blender from blender.org and start a General file. You get a default cube, a camera and a light.
2.Block out the shape
Add simple shapes with Shift A and move, rotate and scale them with G, R and S until the rough proportions look right. Work from a reference photo.
3.Shape it in Edit Mode
Press Tab for Edit Mode. Extrude faces with E, add edge loops with Loop Cut (Ctrl R) and round hard edges with Bevel (Ctrl B).
4.Smooth it
Add a Subdivision Surface modifier to turn a blocky cage into smooth curves. Extra edge loops near an edge keep it sharp.
5.Sculpt the detail
For organic shapes, switch to Sculpt Mode and use brushes to add folds, muscles or scales. A Remesh modifier first gives you an even mesh to sculpt on.
6.Export
Use File > Export > glTF 2.0 for a GLB (games, web, AR) or File > Export > STL for printing.
- Start with a simple object, such as a mug or a chair, before you try a character.
- A low-poly model with clean edge loops is easier to edit, unwrap and animate than a dense sculpt.
2Design printable parts in CAD
Choose CAD when sizes matter: a bracket that must fit a 20 mm pipe, a box for a circuit board, a replacement knob. CAD tools build solids from measured sketches, so a hole is exactly the size you typed and you can change one number later and the part updates.
1.Pick a tool
Tinkercad (free, in your browser) lets you drag, resize and combine basic shapes, and is the easiest start. Fusion is free for personal, non-commercial use with limited features. Onshape runs in the browser and has a free plan for public, non-commercial designs. FreeCAD is open source and free on Windows, Mac and Linux.
2.Set your units to millimetres
An STL file stores no units, and most slicers read the numbers as millimetres. Set mm before you start so the print is not 25 times too big or too small.
3.Sketch and extrude
Draw a 2D sketch on a plane, give every line an exact dimension, then extrude it into a solid. In Tinkercad, drop a box or cylinder and type its size instead.
4.Add features
Cut holes, add fillets (rounded edges) and chamfers, and combine or subtract shapes until the part is done.
5.Export for printing
Export an STL or 3MF for your slicer, and keep the CAD file so you can change sizes later.
- Measure the real object twice with calipers, and leave a small gap where two printed parts must slide together.
- Need a decorative, organic shape on a functional part? Make the shape in Blender or with AI, then combine it with the CAD part.
3Scan a real object from photos
Photogrammetry turns many overlapping photos of an object into a textured 3D model: the software matches the same points across the photos and works out their position in 3D. You can do it with a phone app such as Epic's RealityScan, which processes the photos in the cloud.
1.Choose a good object
Matte objects with some surface detail scan best. Shiny, transparent and plain single-colour surfaces scan badly; a plain surface needs markers, such as removable stickers.
2.Light it evenly
Use bright, diffuse light. Outdoors, an overcast day beats direct sun, and the shadows should not move during the session.
3.Walk around it
Shoot in circles and arches at several heights, with the object filling at least half of every photo and a lot of overlap between photos. A part that is not visible in several photos will not appear in the model. RealityScan starts analysing after 20 photos and takes up to 300.
4.Clean up the scan
Crop away the floor and background, fill holes and reduce the triangle count before you use the model. For an STL, our free STL repair and STL reducer run in your browser.
- Only have 2 to 4 photos? Multi-view to 3D combines front, side and back photos into one model with AI.
4Generate it with AI (the fastest route)
AI 3D generators build a full model, back and sides included, from a short text prompt or a single picture. On The3DAI a model is usually ready in about 1 to 3 minutes, and you download it as a textured GLB or an STL for printing.
1.Describe it, or upload a photo
With Text to 3D, describe one object: what it is, its main materials and colours, and a style, for example "a small wooden treasure chest with iron bands, stylized". With Image to 3D, upload a clear picture of one object on a plain background.
2.Generate and check it
Turn the model around in the viewer. If a part is wrong, change the prompt or try a clearer photo and generate again.
3.Clean up the mesh if you need to
AI models are dense triangle meshes. For games, cut the triangle count in Blender with a Decimate modifier; for animation, rebuild cleaner topology (retopology) over it.
4.Texture and export
Repaint the surface with the AI 3D Texturing Studio, then use the GLB in Blender, Unity, Unreal or Godot, or the STL in your slicer.
- Use one object per prompt or photo: the tools are made for single objects, not whole scenes.
- AI shapes are not measured. For a part that must fit something, design it in CAD.
After you have a model
Texture it
Grey model? The AI 3D Texturing Studio paints it from every side from a short description (2 credits per AI view). It keeps your mesh exactly as it is, and the seam-heal brush, hand paint and PBR maps are free.
View it or convert it
Open a GLB in the 3D model viewer or an STL in the STL viewer, which also checks that it is watertight. Change formats with GLB to STL, OBJ to STL or any tool in the STL file converter hub. They run in your browser for free.
Print it
- Make it watertight and manifold. A printer needs a closed shell where every edge joins exactly two faces. A hole or a stray face confuses the slicer. Fix it with STL repair.
- Check the size and units. STL stores no units, so check the size in your slicer, or set an exact height in mm with Scale STL.
- Check wall thickness. Thin parts below your printer's minimum thickness disappear or snap. Thicken them in your 3D app.
- Keep the file light. A very dense scan or AI mesh slows the slicer down; reduce the STL file size first.
- Estimate the filament. The STL volume calculator gives the volume, weight and print cost.
- STL has no colour. For a colour print, keep the textured GLB or use a format such as 3MF.
- Want a printable file straight away? Text to STL and Image to STL give you the STL first.
Make your first 3D model now
Describe an object or upload a photo, and download a GLB or STL in a few minutes.