Connecting rounded rectangle with circle

I’m currently trying to come up with a model to print on my 3d printer.
However I’m running into a problem with connecting 2 shaped to make it into a solid.

I have a rectangle with the top sides rounded. underneed it there is a circle (about 6cm down) with a inner diameter of 38mm and outside of 42mm. I wan’t to connect these 2 objects with eachother.

I’ve attached a file in which the current drawing is and you can see I’m trying to figure out how to get it to match up perfectly. I’m hoping someone will be able to point me in the right direction, have been playing with it for 2 days now and it’s starting to drive me crazy.blower.skp (432.7 KB)

Curviloft may be of some use. If in fact this is your goal.


Thats exactly what i needed awesome, going to try that right away!

@Shep, quick question maybe you could help me out here. I’ve got it to work and have 2 solid groups but as soon as i try to make them as 1 it’s not a solid group anymore.

See the result of how it is with 2 groups here.
blower.skp (472.8 KB)

Here’s what Solid Inspector2 shows when both groups are exploded and a single one made.

Instead of making the tube and trying to connect it to the upper part, why not just extrude the bottom ring of the upper part using Push/Pull? The group will still be solid.

I got it, I just remembered that I made the sides circle of the bottom part 100 and for the top part 40, so I redid the top part with the same number of sides and now it’s working.

I couldn’t just use Push/Pull because the bottom part is smaller at the top then on the bottom.

Yes you could use Push/Pull. Then use the Scale tool to scale the bottom ring as I did here.
blower.skp (313.7 KB)

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