Where to find free 3D models to print

You do not need to design anything to get a great deal out of a 3D printer. Millions of ready-made models are free to download, and for most owners that library is the real product: the printer is just how you get things out of it. The catch is that the good sites and the bad ones look similar from the outside, and the same model is often uploaded to five of them. This is where to look, and for what.

The sites worth using

Printables

Printables is run by Prusa Research and is the best all-round starting point. It is free, well moderated, has a clean search, and its models usually come with photos of real prints, called “makes”, from people who have already tried them. Many models include ready-sliced print files and recommended settings. Regular design contests keep new, practical models arriving. It works with any printer, not only Prusa machines.

Best for: almost everything, and anyone's first search.

MakerWorld

MakerWorld is Bambu Lab's site and has grown very quickly. Its distinguishing feature is the print profile: a model usually comes with one or more complete, tested setups that open directly in Bambu Studio, including multi-colour versions. For Bambu owners this is the closest thing to pressing a button. The models themselves can be downloaded and sliced for any printer.

Best for: Bambu Lab owners, and multi-colour models.

Thingiverse

Thingiverse is the oldest of the big sites and still has the deepest back catalogue. If you need a replacement knob for a fifteen-year-old appliance or a bracket for an obscure piece of kit, there is a good chance somebody uploaded one here years ago. The search and the site itself are less polished than the newer alternatives, and many listings are old enough that the designs assume slower, less capable printers.

Best for: spare parts, obscure fittings and older designs.

Thangs

Thangs is both a model site and a search engine that looks across the others. Its useful trick is searching by shape: it can find models that are geometrically similar to one you already have, which helps when you know what a part looks like but not what it is called.

Best for: searching several sites at once, and finding a part by its shape.

MyMiniFactory

MyMiniFactory is more curated than the others, with a strong lean towards tabletop miniatures, figures and sculpture. Free and paid models sit side by side. It also hosts Scan the World, a large free collection of 3D-scanned sculptures and artefacts from museums.

Best for: miniatures, figures, and museum sculpture.

Cults

Cults is a marketplace where free and paid models are mixed together. The paid designers are often very good, so it is a useful place to look for something more polished than the free sites offer, but filter to free models if that is all you want.

Best for: higher-end designer models, with a free section.

Search engines that look across all of them

Because the same model is frequently uploaded to several sites, a cross-site search saves time. Yeggi indexes models from most of the major libraries, and Thangs does the same alongside its own catalogue. Use one of these when a search on a single site comes up short. Expect some results to be paid models or dead links.

Free models from museums, NASA and science

Some of the most interesting free models do not come from hobby sites at all.

• NASA 3D Resources — spacecraft, rovers, asteroids and terrain, free to download.
• Smithsonian 3D — scans of objects from the Smithsonian collections, from fossils to aircraft.
• NIH 3D — biomedical models: molecules, anatomy and laboratory equipment.
• Scan the World — museum sculpture, as above.

Scanned objects are often very detailed and were not designed with printing in mind, so they can need supports, scaling or repair before they print well.

For functional and engineering parts

GrabCAD is a library of engineering CAD models rather than a 3D printing site. It is the place to find accurate models of real components, such as motors, bearings, connectors and extrusions, usually as editable STEP files. You will often be using these as a reference to design around rather than printing them directly.

How to tell whether a model will actually print

A beautiful picture is not evidence that a model works. Before you spend four hours and eighty grams of filament, check these:

• Photos of real prints. Look for makes from other users, not just the designer's image. This is the single best signal. A model with dozens of successful makes will print.
• A photograph, not a render. Computer-generated images are common, and some listings now use images that were never a physical object at all. If every picture is too perfect, with no layer lines anywhere, be cautious.
• Print settings. A good listing states layer height, infill, and whether supports are needed. “No supports required” is worth looking for when you are starting out.
• The comments. Other people's failures are recorded there, along with the fix.
• Size. Check the dimensions against your build plate before downloading. See how big a build volume do you need.

File types: STL, 3MF and STEP

• STL is the long-standing standard. It contains the shape and nothing else: no colour, no settings, and no units, so a model can occasionally import at the wrong scale.
• 3MF is the modern replacement. It can carry several parts, colours, and complete print settings in one file. If a model offers both, take the 3MF.
• STEP is an editable CAD format. You want this if you intend to change the design, for example to alter a hole size.
• G-code is a finished set of instructions for one specific printer, not a model. It is better to download the model and slice it yourself. G-code from a stranger tells your printer exactly what to do, including temperatures and movements, and you cannot easily check it first.

What “free” lets you do

Free to download does not mean free to do anything with. Almost every model carries a licence chosen by its designer, usually one of the Creative Commons family, and it is shown on the model page.

• Attribution (CC BY) — use it for anything, including selling prints, as long as you credit the designer.
• Non-commercial (CC BY-NC) — print it for yourself and as gifts, but you may not sell the prints. This is very common, and it is the one that catches people out.
• No derivatives (ND) — you may print it but not publish a modified version.
• Share alike (SA) — if you publish a modified version, it must carry the same licence.
• Public domain (CC0) — no conditions at all.

If you only ever print for your own use, none of this restricts you. If you are thinking of selling prints at a market or online, check the licence on every model first, and look for designers who offer a separate commercial licence. Models of characters and logos from films, games and brands raise a different issue: the uploader may not have had the right to share them in the first place.

Good first downloads

• A calibration print, such as a small test boat or cube, to confirm the printer is set up properly before anything larger. See first layer calibration.
• Something useful and small: a cable clip, a hook, a phone stand.
• A print-in-place toy: an articulated animal or a fidget, which comes off the bed already moving and shows what the machine can do.
• A modular storage system for your desk or toolbox. These are free, endlessly extendable, and a good way to use up plain filament.
• Upgrades for the printer itself: a spool holder, a tool tray, a cable guide. See spool holders and why they matter.

Most of these print best in plain PLA. If you have not bought filament yet, start with your first filament order, and for colourful toys see how many filament colours do you need. Compare filament ranked by price per kilogram, or if you are still choosing a machine, the printer finder recommends one from our reviews.

Questions people ask

Where can I download free 3D models for printing?

The best sites for free 3D printing models are Printables, MakerWorld, Thingiverse, Thangs, MyMiniFactory and Cults. Printables is the best all-round starting point, MakerWorld is strongest for Bambu Lab printers and multi-colour models, and Thingiverse has the deepest back catalogue of spare parts. Thangs and Yeggi search across several of these at once.

What is the best website for free STL files?

Printables is the best single website for free STL files for most people. It is free, well moderated, works with any printer, and most models include photos of real prints from other users along with recommended settings. MakerWorld is a better first choice if you own a Bambu Lab printer, because its models come with tested print profiles.

Is Thingiverse still worth using?

Yes, Thingiverse is still worth using for its back catalogue. It is the oldest major model site and often the only place to find replacement parts and fittings for older or obscure products. Its search and site are less polished than Printables or MakerWorld, so use it when a newer site does not have what you need.

Can I sell prints of free 3D models?

Only if the model's licence allows it. Many free models use a Creative Commons non-commercial licence, shown as CC BY-NC, which lets you print for yourself and as gifts but not sell the prints. Models licensed CC BY or CC0 can be sold, with credit to the designer required for CC BY. Always check the licence on the model page first.

What is the difference between STL and 3MF files?

An STL file contains only the shape of a model, with no colour, settings or units. A 3MF file is the modern replacement and can hold several parts, colours and complete print settings in a single file. If a model is offered in both formats, download the 3MF. Both open in all current slicers.

Are free 3D model files safe to download?

Model files such as STL and 3MF from the major sites are safe to download, because they describe a shape rather than run as a program. Be more careful with ready-made G-code from strangers: G-code directly controls your printer's temperatures and movements and is hard to inspect. Download the model and slice it yourself instead.

How do I know if a 3D model will print well before I download it?

Look for photos of real prints from other users, usually called makes, rather than only the designer's image. A model with many successful makes will print. Also check that the listing states layer height, infill and whether supports are needed, read the comments for reported failures, and confirm the dimensions fit your build plate.

Do I need to learn CAD to use a 3D printer?

No, you do not need to learn CAD to use a 3D printer. Millions of ready-made models are free to download from sites such as Printables, MakerWorld and Thingiverse, and many owners never design anything themselves. Learning basic CAD becomes worthwhile when you need a custom part that nobody has already designed.

Where can I get free 3D models of real objects or museum pieces?

NASA 3D Resources offers free models of spacecraft, rovers and terrain, Smithsonian 3D has scans from the Smithsonian collections, and Scan the World on MyMiniFactory hosts free scans of museum sculpture. NIH 3D provides biomedical models such as molecules and anatomy. Scanned objects often need supports or scaling to print well.

What are good first models to download for a new 3D printer?

Print a small calibration model first to confirm the printer is set up correctly, then something small and useful such as a cable clip or phone stand. After that, a print-in-place articulated toy shows what the machine can do. All of these are free to download and print well in ordinary PLA.