The granddaddy of 3D model sites, Thingiverse has over 100,000 models and is easy to add to and "remix" your own versions. There are groups you can join, rating systems for models, and challenges where you can compete to complete a task.
From Sketchup, the 3D warehouse contains models ranging from printable nuts, bolts, and washers, to colossal buildings like the Burj Khalifa. These models are in the Sketchup format but can be converted for printing easily.
Hosts the Scan The World collection: the largest collection of 3D scanned statues and artifacts from around the globe. Filter your search by "free" to see freely available models.
A large repository of 3D models that can be viewed in a web browser or downloaded for use in other software. Sketchfab offers a mix of free and paid models, but the quality can vary greatly.
Common 3D Printing File Formats
An article explaining the pros and cons of STL, OBJ, AMF, and 3MF file types.
The articles below go into detail about each file type if you want to read more.
PLA is environmentally friendly, biodegradable, and non-toxic. This is what the actual model is built from. It can also be used as support material. PLA comes in many different colors and types. If you would like to learn more about each type of PLA filament see the links below.
A short explanation of PLA, listing the Pros and Cons of this material.
A detailed guide on using Soft PLA filament
A detailed guide on using glow-in-the-dark PLA filament
Tips for painting, sanding, and smoothing your 3D prints.
Beginners Guide to Painting PLA and ABS
This guide covers smoothing, priming, and painting your 3D print.
Basics: How to post-process your 3D prints!
A video giving tips on how to post-process your prints.
Tips and tricks for fixing common 3D printing problems.
How to Design Parts for 3D Printing
When designing objects for 3D printing, you want to keep certain limitations in mind, such as tolerances, supports, overhangs, orientation and more. This article gives a nice summary of what to consider and how to approach each problem.
Print Quality Troubleshooting Guide
A guide of helpful tips to enhance your 3D prints quality. This guide troubleshoots more than 20 common problems for 3D printer.
The websites below are all services where you can pay a professional company or individual to print for you. This is a good choice if you need your item printed in special materials, printed at a higher quality, need lots of copies, or have a model with a very long print time. These sites are also helpful if you do not want to learn more about 3D printing and want someone else to do the work.
Make XYZ is a network of verified printers. Submit a model and it will be printed by the closest printer.
Shapeways offers printing in a wide variety of materials. They also have a shop for 3D designs you can order if you do not have your own model.
3D Hubs offers prototypes with multiple machines, including 3D printers and CNC.
Kraftwurx is known for its wide variety of materials (85+) for 3D printing.
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