SOLVESPACE -- parametric 2d/3d CAD

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Teach me to extrude (by Dale Wheat)
I'm using SolveSpace 2.0 to model a part that I want to 3D print. I was able to create most of the part as I wanted it, but can't seem to get the "difference" extrude to carve out a section. I was able to successfully complete the tutorial, however.

I first designed the base that has the two mounting hole and extruded that to the desired thickness. Then I created the main part of the "foot" and extruded that. Then I drew an arc on the side face of the foot and closed it with a line segment, then tried to extrude that sketch as a "difference" through the rest of the foot, leaving an arch.

Everything seems to work, except that the arch is not carved out of the foot. I have attached screenshots to help visualize what I wanted.

I was able to export the part to STL and then import it into Autodesk 123D Design and then subtract a cylinder to obtain the desired arch shape, and then print the parts. But surely I should have been able to do all of this in SolveSpace, yes?

I've read the reference manual and it doesn't mention the "difference" option for extrusion.

Should I have added the arc to the original sketch of the foot before extruding it? What am I doing wrong?

Any help is appreciated. I am impressed that I was able to lay out this part exactly from a single dimension (mounting hole center-to-center distance) and have everything come out exactly as I wanted on the first try. SolveSpace is an amazing tool!

Dale Wheat
Sat Feb 7 2015, 19:05:32, download attachment foot with arch.png
(no subject) (by Dale Wheat)
Here is how I was able to complete the design using Autodesk 123D Design, just to give you an idea of what I was trying to do. I'm much more interested in learning how to do this type of work in SolveSpace.
Sat Feb 7 2015, 19:07:20, download attachment foot with arch in 123D.png
(no subject) (by Dale Wheat)
And lastly, here is my SolveSpace document, in case it will help to figure out where I went wrong.
Sat Feb 7 2015, 19:11:18, download attachment wire cutter foot.slvs
(no subject) (by Jonathan Westhues)
Your contour isn't quite closed in g008--the endpoints of the arc and the line are very close to each other, but not coincident. There's a warning to that effect ("not closed contour, ..."), unless you've disabled it.

To fix that, you could delete one of the point-on-line constraints, and replace it with a point-on-point constraint. The warning should then disappear, and the contour should appear slightly shaded. Your extrusion should then proceed as expected.

Thanks, and let me know if you still have trouble.
Sat Feb 7 2015, 19:20:44
(no subject) (by Dale Wheat)
And it's fixed! And it was that easy.

Thank you, Jonathan.
Sat Feb 7 2015, 19:51:27
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