Remove a custom material from your Toolbox to remove it from the material drop-down menu near your project's cut settings.
Your Toolbox is linked to your account, not a specific project. This allows you to access your Toolbox bits and materials across all your projects. Deleting a custom or Inventables material from your Toolbox removes it from your Toolbox permanently (don't worry, you can always add it again). This will also remove the material from your other project files.
1. Click on the Easel icon in the top right corner to open the Account pop-up. Click on the Toolbox tab.
2. Select Materials from the top navigation.
3. Navigate to the material you want to remove from your Toolbox. Click the arrow in the top right corner of the material's image and click Delete. Confirm your choice by clicking Ok in the pop-up.
Note: once a custom material is removed from your Toolbox, it is removed from your account and the material drop-down menu near your project settings. You can add custom or Inventables materials back to your Toolbox at any time, even if you have previously deleted them.