Trouble perfectly modelling a cavity to fit within another piece

[buenavea]

Hi Inventor community, 

I have this piece in which I have a depression on the inside. I want to model a separate piece that will perfectly fit into this depression/cavity but I am having trouble achieving the exact measurements to match this. Is there an easy way I can achieve this? IPT file attached below. 

For context the reason why I am not modelling it as one piece is because I plan to print these parts using two different plastics on a 3D printer. 

Thanks for your help! 

[-niels-]

Use multibody modelling and then "make part" for each solid.
(sorry, no real time to explain and your IV version seems to be older then mine so i can't share the part)

[blandb]

The part shared doesnt appear to be what you posted?

[buenavea]

are you able to share screenshots of how you did it? I am having a hard time visualizing how to do it, and any time I do it, its absent of the curvature I need for the piece to fit perfectly within the frame. @-niels- 

[buenavea]

@blandb whoops, sorry about that, thanks for catching it. Try one of the files below. 

[blandb]

Another method is deriving. Please see the quick attached video:

[buenavea]

I'm afraid I do not see an attachment, not sure if its lagging behind or if it didn't get attached  @blandb

[blandb]

I may have hit "post" too fast before it was fully uploaded.

[-niels-]

This is just an example with what you posted, you'll have to apply the method in the way that generates the shape you actually need.

I used the sketch that was present and this might not be the most optimal method, but hopefully you'll get some inspiration from it.

Hope this helps.

[johnsonshiue]

Hi! This is fairly easy to do using Surface Modeling techniques. It is better to reuse what is already available than to create new geometry from scratch. You just need to get those faces and then sculpt it to a new solid body.

Many thanks!