Maybe just one additional thought if the topic is bumped anyway; when you make a group and later (when you do not need it) explode it, there won't be any (noticeable) traces of it in the model. An exploded component will however remain in the file and you can still access it in (and insert it from) the Component browser. This way, if you are not careful enough and keep playing with various ideas and download several components (of uncontrollable file size) from the Warehouse into your model, even if you discard them, they will make your file size really huge. Therefore you always need to purge your model regularly (although be careful NOT to purge whatever is needed) See example below: [image: PurgeComponents.jpg] There can be unused components, materials, styles and layers in a model. The first three can considerably boost the file size (styles only if you are using some sketchy style with high resolution watermark background image for instance). In every similar dialog, there is the option to purge them OR you can do it altogether under your Model info > Statistics tab. Lately the 3D Warehouse warns you of unused items (such as above) and offers you to purge them before uploading. This is cool IMO - otherwise one would import Sang or Bryce like a thousand instances after each other.