Fixtor, thanks! I have measured the distance between two points that should become coincident, and got a value of ~4.5e-07. This is slightly above OCC's Precision::Confusion, which is 1e-7 AFAIK. Any sizes that come close to Precision::Confusion are evil. For the stuff to work reliably, the distance...

I would recommend you to complete the one half, and then simply mirror your model against XY plane and fuse the mirror with the original. Alternatively, you can detach the sketch from support (use Reorient Sketch command in the menu), and then simply lower the sketch to desired position by adjusting...

Fixtor, BTW, what version of FreeCAD are you using? I was able to fix the model. In Sketch007, I reassembled all tangent joints to point-to-point tangency instead of coincident+tangent. There were a few (some were proper). I also did this to Sketch, where all tangent joints were correct, but it was ...

Looks like this is the first boolean operation fail caused by coplanar faces I've seen so far .

frecd wrote: Maybe the combo view buttons are handy enough, I just didn't look after selecting two shapes, I'll have to check.

Yes, they only come active once you select at least two objects.

There's some useful goodness in the presentation I'm saving it.

NormandC wrote:A proper way would be to make the "Rail" thicker so its top face exceeds the face of the Body instead of being coplanar to it.

If you look closer, you'll notice axk actually did that.

Reproduced. OS: Windows 8.1 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.15.4498 +7 (Git) Branch: sketcher-FixReversedGeoms-emulation-squashed Hash: 3e8f7f5738b13dbfbe5b1ef87b8421a3801646b5 Python version: 2.7.8 Qt version: 4.8.6 Coin version: 4.0.0a OCC version: 6.7.1 BTW, I have...

What I want to do is remove everything that is not _both_ a and b, and then completely remove what's left of b. If I got your intention right, you need to: * Select a, then b (the order matters), * Click http://www.freecadweb.org/wiki/images/thumb/4/4a/Part_Cut.png/32px-Part_Cut.png Part Cut . EDIT...

The one that is not working for you is working well for me (I just used Macro ForceRecompute ). OS: Windows 8.1 Word size of OS: 64-bit Word size of FreeCAD: 64-bit Version: 0.15.4498 +7 (Git) Branch: sketcher-FixReversedGeoms-emulation-squashed Hash: 3e8f7f5738b13dbfbe5b1ef87b8421a3801646b5 Python ...