Free model

Free models are models created by the community for other users to get and use in experiences. These models can be bought for free in the "models" section of the creator marketplace. Accessories bought by the player are also treated as models and can be used in Roblox Studio.

Using free models
Models can be bought from the creator marketplace, as stated above. However, cannot be bought from the avatar shop. In Roblox Studio, all models that are on-sale can be used without actually owning them. However, there is a tab in the Toolbox where owned models can be used.

Originally, experiences were also able to spawn free models from the avatar shop. However, this feature was later removed, likely due to the potential for exploits.

Endorsed models
Endorsed models are models that are officially selected by Roblox staff. They follow specific criteria, such as being able to run without any bugs, errors, or lag, being easy to edit, being able to run independently without having to load other models or modules, and high-quality. The developers who publish these modules receive Robux as commemoration for their work, and their models are typically displayed before others in Roblox Studio's toolbox. Roblox typically endorses models that are made by well established developers, the most prominent ones including Quenty, UristMcSparks , and NWSpacek. .

Endorsed Models do not include viruses meaning they are safe to use.

When a developer gets official endorsement on one of their models by Roblox, they receive the 'Official Model Maker' badge.

Lack of effort
Despite multiple occasions of Roblox encouraging the use of free models, they are often frowned upon by the community. Much of the community believes the use of free models indicates a lack of effort on the creator's part because they used another person's work (and often without giving credit to said person) instead of creating it themselves. Some believe that this shows a lack of creativity and commitment to create an experience with fully original assets, which in turn means that they are a bad developer, hence, breaking any trust the end-user may have with their experience. Some developers of kits will also sneak a hint box into various kits, which usually says "thanks to the creator of the kit". When deleting the hint creation code, the kit will no longer work. Even more confusing is that the code that makes the kit reliant on the hint is well camouflaged. Some models may also create a small text GUI on top of the screen that says the creator of the experience thanks the original creator of the model, sometimes even without the creator of the experience knowing it.

Infected models
Some free models are known to contain malicious scripts that clutter the workspace, lag the experience, and/or even open backdoors for malicious players. For this reason, many users stay away from free models. A good way to make sure a model doesn't have an infection script is to check all the parts of the model in Roblox Studio (by clicking the small arrow next to the model in the Explorer tab), if it is a model that doesn't need any scripts in it, a user can run a command in the command line to remove all scripts, or if it is a model that does require scripts, users can use an antivirus plugin (although they must make sure to only use ones that are safe and verified). Most are found in the form of a weld and the name is often something obvious to its intention, such as "u got pwnd". These kinds of scripts date back to 2008, (though most are broken by now). Other names include: "ERoblocker", "Script........... or is it", "Guest Talk Script", "Anti-Lag", "Infection", "4D Being", "Vaccine", and much more. Copied models always tend to have a virus in the model. Despite these models having Malicious Scripts, they can be removed from the model.

Trivia

 * There have been multiple instances of users being able to sell free models for Robux. The users who sold these models were banned soon after.
 * Users can use free models if they are not so great at scripting. However, it is encouraged to give credit to the creators of the model by listing their names in the description or in the experience itself.
 * Most old Models have been deleted.
 * Many old Models, especially ones with scripts, have been broken due to Roblox updates.
 * Users often steal other models and publish them under their own name, Julius coles being one of the most known for doing it.
 * Users can make a thumbnail for a free model by copying the camera, pasting it to a model then changing the name of the camera in the model to "ThumbnailCamera".
 * Many developers of kits will put a hint in the script of their kits that gives thanks to the creator of the kits.
 * Whenever a user removes the line of code that creates the hint, the whole model(kit) will stop working completely. It is almost impossible to fix this problem without recreating the hint because there is almost no code that refers to the hint and output doesn't put out any errors neither.


 * Some humanoid free models lost their clothing due to their clothing templates being deleted.
 * Back in 2011–2013, whenever users published a model, the name would be automatically set to "Model (number here)". It was still possible to change the model name even if the name was set to this. This naming system has been removed since then.