Many thanks. Looks like I'll have to go through it with a fine tooth comb then! Is there any way I can quickly find tiny gaps, or do I need to totally reassemble the whole thing again. Fortunately, I saved some of it before joining it together, unless there is also a fix for unboolianing (a verb I have previously never used before!) the sections?

Tx G

Hi Gord, there isn't really any way other than zooming in and inspecting things closely.

re: unboolean - it is possible to separate surfaces from the main piece by using Edit > Separate on them and then doing things like using "untrim" to erase trim curves. But you'll be working at the surface level for that it's not quite the same thing as an "unboolean" exactly. There is a tutorial on that kind of surface level repair work here though: http://moi3d.com/forum/index.php?webtag=MOI&msg=446.17

- Michael

Hi Gord,
If you want to 3D print that model "as is" I would say just select everything and export it as STL.
I found this workaround OK as long as you won't split your object in slicer program.
I've had hard time combining complex objects and if I export everything selected, slicer program accepts it as one object.
I use slic3r PE and it works fine.
However I recommend to check layer preview before hitting print.

Juraj

I have gone over everything again and it is now joined up. I have saved as .STL and am sending a test piece off to the print company for their comments.

Thanks!

Gordon

Just a thought
You can try not joining your parts and export the stl file with all of the components , I find that if they are touching or intersecting each other it should print.
I find unioning parts sometimes generates errors
Also Un unioned models are easy to change later if there any problem parts
cheers
shayne