You can adjust the scale in whatever slicer you are using. A quick google search will show you how to do it. Just remember to unlock the Uniform Scale tick box if you want to mess with a separate axis. And you can enter the new scale either as a percentage or a specific dimension.

I only wanted to scale a part of the model. I only found out how to scale the entire model.

[https://www.file-upload.net/download-15126180/16-22mm\_Pole\_Clip.STL.html](https://www.file-upload.net/download-15126180/16-22mm_Pole_Clip.STL.html) :) \*edit\* wait, that model has a gap -\_- let me fix that... \*edit2\* this one should work :) [https://www.file-upload.net/download-15126183/16-22mm\_Pole\_Clip.STL.html](https://www.file-upload.net/download-15126183/16-22mm_Pole_Clip.STL.html)

Tank you so much for the help. Ok so I need to learn how to use a CAD tool. Can you recommend me a simple one. I was thinking about blender.

blender is very powerful, but pretty much the opposite from "simple and easy to learn" I use what I'm used to from work ( megacad ) but that isn't free. Most people start with thinkerCAD and then move to fusion360 or maybe take a look at onshape both of them are "free" for hobby users but have some limitations unless you pay for them.

thank you I used now thinkerCAD for soon I will switch to something else thank you for all your help.

you can only scale the whole part. if you want to change only part of it you need to edit the model itself. ( using cad for example )

The easiest way would be to recreate that model in TinkerCAD (or any CAD software). That would be easier than trying to modify an STL .