STL import adjustments problem?

Hi, I have been using this great app for the second year now but I’m still at a very GCSE level of skill.
For the first time I have imported a STL file of a propeller and all I want to do is make the prop shaft hole Dia a little wider but I am only able to extrude my larger hole. I’m sure it’s a very easy fix but I’m stumped.

Anyone that could help me please help.


Hi Jim, it seems like you will need to create a new body that can be used with the Subtract tool to cut the hole wider.
Please can you attach a screenshot showing the STL design?

Thanks Victor, what do you think?

Hi Jim, I apologize for the delayed response.

From the attached image, it’s difficult to tell how you can correctly use the sketched circles to make the hole on the propeller wider.

Please can you send the design file to We will look into it and then get back to you as soon as possible. Thanks for your patience.