180 Wrapped Tubes Herbert Edelsbrunner's site offers a collection of 180 mathematical models produced by sampling and wrapping point sets on tubes. The surfaces are triangulated 2-manifolds and available as stl files.
3D CAD Browser A 3D CAD model exchange system where you can download 3D models and upload your models in exchange. More than 5,000 models available in major file formats such as .3DS, .DXF, .DWG, .OBJ, .LWO, .IGES. Requires annual paid registration.
3D Cafe Offers numerous three dimensional files for downloading either for purchase or as freeware. Several file formats available.
3D ContentCentral Free models of 3D parts and assemblies, 2D blocks, and macros for CAD users. A large library of user- and supplier-contributed models.
3D Printing Model Offers a number of categories of 3D-printable models such as art, house accessories, jewelry, gaming, etc. Prices range from a few dollars into the hundreds and some very nice artwork can be had at very reasonable prices.
3DM3.com This site offers about 350 free models in about 20 categories. The emphasis is on characters, toy weapons and architectural items such as furniture.
3dModelFree.com Offers a largely architetectural selection of free models, including furniture and appliances.
3Docean A wide variety of 3D content, some quite reasonably priced although nothing for free. The categories are especially well-populated for architectural and furnishing items. One interesting little feature is that the number of previous sales for an item are shown. Most of the two to three thousand models on the site don't seem to have resulted in a sale.
3dputty.co.uk 3dputty.co.uk offers detailed 3d models in .max, .3ds and .obj formats. categories include technology, architecture, household, vehicles and the site has an especially wide selection of furniture. New, detailed models added weekly. Can create custom models to client requirements and also offers several free samples.
3DScience.com Provides an archive of human anatomy and biological models. There doesn't appear to be any free content, but some of the simpler models are fairly affordable.
Amazing3D.com Offers a many files without charge, and has numerous categories of files for sale. Has especially good coverage for aircraft models.
Anatomics Pty. Ltd. Offers sample medical and anatomic files.
Archibase.net This architecture portal simply offers another way into Archive3D.net. See below.
Archive3D Archive3D offers literally thousands of free models with a heavy emphasis on needs of the architect, such as home furnishings, site improvements, etc. An enormous archive of designer furnishings is included. Several other categories are available, as well, such as aircraft, people, etc.
Autodesk 123D A web-site with thousands of detailed 3D models in categories such as cars, aircraft, architecture and interiors, furniture, earth, plants and human characters. Most content is paid and in formats which can be converted to STL.
Avalon Public three dimensional files archive.
Dr. Gill Barequet's Home Page Professor Barequet of the Faculty of Computer Science of The Technion (Israel) has a collection of human organ models and terrains in polygonal slice format.
Body Replicas A subsidiary of Javelin 3D, this site is dedicated to MRI/CT Data Reconstructions. From human skulls to complete spinal reconstructions. Online ordering and electronic downloads available.
Cadyou A wiki for CAD files. It provides a library of 2D and 3D models that anyone can contribute, improve or edit. The site is especially strong for architecture- and design-related files.
CGTrader An exchange for a wide range of 3D models in numerous categories. Thousands of models are offered at moderate prices and there are a few free samples scattered about, as well. The site also allows users to bid on the price of a model and authors to either accept or reject a bid.
Clemson University Follow the link to Clemson's FTP site.
Cubify.com 3D Systems' consumer creation community. Introduced in January, 2012, the site has moderately expensive models, 2D photographs, and additively-products, (some outrageously priced), for sale. The ultimate intent is to build a Thingiverse-like site that offers creators a slice of the economic pie rather than being completely open-source.
Cyberware Human body files. Sample files are available in PLY format, but can be converted with a translator available on the site.
DAZ 3D Numerous designers offering a wide range of three-dimensional models, or detailed features such as hair. The site is an especially good source for human models for gaming, but also has good sets of transportation and object models.
DeEspona.com (Spain) A large selection of three-dimensional files in many categories, with a good number offered at no charge.
DEFCAD Hosts an array of potentially lethal files, from rifle and pistol accessories to ammo and grenades. The site is run by Defense Distributed, an outgrowth of the organization's controversial attempt to use 3D printing to fabricate a useable gun.
Digimation Offers high-quality, technically accurate 3D models in OBJ format. The company's model libraries contain more than 30,000 objects. Doesn't offer free content.
Find-3D.com A general 3D portal with listings for numerous free and paid file sources.
Flash Fire Designs Offers more than 250 models in a variety of formats in such categories as: animals, architecture & urban, characters & humans, food & kitchenware, furniture & household, gems & jewelry, geography, plants, space & electronics, sports, terrain, transportation & road signs, weapons & tools. A free sample model is also available.
Forme It A UK site that offers high-resolution scans of items in the real world. The collection is broken into three categories: Reference, Classic and Modern. Reference includes objects from urban and natural environments, including shells, crystals and insects. Classic is includes items like cups suitable for transformation into customised designs. Modern includes specific works ready for 3D printing.
Georgia Tech Follow the link to Georgia Tech's FTP site.
Google 3D Warehouse Offers numerous models. Most are architectural or historical in nature based on Google Earth.
GrabCAD A community of 40,000+ mechanical engineers established to share models and also to both seek and get CAD design work. Free CAD models from small nuts and bolts to engine parts, furniture, weapons, jet-fighters, motorcycles and cars. All models are created by members and are shared for free.
Grain Grain may be an erroneous idea, but it's pretty well done. It provides files that have been massaged and optimized for specific 3D printers. No tweaking necessary; download and print. There are just a handful of files available as of its inception April, 2013, and the site only currently supports Makerbot's Replicator 1 (ABS or PLA) and 3DSystems' Cube (Version 2, ABS or PLA). However, coming Soon will be the Replicator 2, 3DSystems' CubeX. The Formlabs Form 1 and UP! printers.
George W. Hart Artist George Hart offers numerous interesting mathematically-based scupture files for free that will give your RP machine a work out. He also discusses the underlying geometry in a number of papers available on the site starting at his home page.
Hongiat.com A blog of on-line tips for designers and bloggers which lists about 60 model sites. Many, if not most, are free. The main emphasis is on architecture, interior design and animation, but there are other listings, as well. Many additional resources are provided by the comments to the blog.
Institut National de Recherche en Informatique et en Automatique (INRIA) A French research institution focusing on computers, control and mathematics. The Gamma project at INRIA is intended to develop automatic mesh generation algorithms and has an enormous repository of 3D files for their researchers to draw from. In addition, a listing is provided of the hundreds of sources of these files. Be forewarned that the copyrights associated with these files vary enormously and the source must be carefully checked before use.
International PARTserver Community Download free 3D CAD models in native and neutral formats. The archive is a compendium of more than 500 manufaturers' digital catalogs and covers most aspects of engineering and technology.
Javelin 3D Offers Body ReplicaTM Collection on CD. It contains 25+ anatomical 3D reconstructions in STL file format, plus QuicktimeTM movies and 2D graphics. The 3D anatomical reconstructions were produced by tissue segmentation of 2D gray-scale image data from computed tomography scans, magnetic resonance image data and output from microscope studies. Also see the company's Body Replicas web-site, described above.
MakerLove Offers files for sex toys that you can 3D print in the comfort and privacy of your own home. It's actually a market ploy to sell the company's bullet vibrators, but what the heck...
Mesh Factory Has transportation, animals, insects, technology, anatomy, architectural and household objects, weapons and more, but not free.
Model Masters Heavy emphasis on transportation, but other things, too. Several file formats and also has a few free items.
NASA NASA offers free space-related files of items ranging from a highly-detailed model of the International Space Station to individual hand tools and details like tethers. There are also historical models including the Apollo Lunar Module and Skylab.
Ocnus' Rope Company Offers many free categories of VRML format models with links to numerous other free files. Most models are not very detailed, but could be useful starting points for modifications.
The Pirate Bay Started in January, 2012 the Physibles category hopes to do for STL files what BitTorrent has done for movies. Uh oh.
rocky3d.com Offers a substantial number of models in a wide range of categories free. Also can supply special items for a fee.
Shapeways This on-line 3D creation community has numerous files available under a Creative Commons license. You must be a community member to download files, however, but that's free.
The Stanford 3D Scanning Repository Intended to support researchers who do not have access to scanning facilities or dense polygonal models for the development of scanning devices and surface reconstruction algorithms. The archive is intended to make some data and detailed models available to the public.
The3dStudio.com A repository with over two million 2D and 3D resources including textures, tutorials, stock images, and vector images. While nothing is free, prices are moderate. Owned by 3D Systems.
Thingiverse Makerbot's repository of open-source models has thousands of items ready for 3D printing. A large percentage can be viewed as 3D test patterns, but there are many utilitarian and artistic items as well.
TraceParts Offers a free portal to 100 million CAD models, product datasheets and hundreds of supplier catalogs for design, purchasing, manufacturing or maintenance processes.
TurboSquid A large selection of three-dimensional files in many categories, with a good number offered at no charge.
Ultimate 3D Links This is an extensive directory site which also covers all aspects of 3D applications tutorially. Also has a file archive.
Visible Productions The company provides an extensive library of antomical models based on the National Library of Medicine's Visible Human data sets.
X-TRUSION (Spain) Offers an array of 3D models in various formats. Emphasis is on human figures and groups of figures.
Yeggi A search engine for printable 3D models that came on-line in April, 2013. The idea is to combine models gathered from many of the sites on this list into one database. Works well, but the vast majority of models are from Thingiverse.
Up one Level
Add a listing!