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Split function : "tool cannot split the selected part"

JFMorissetteJFMorissette Member Posts: 2 EDU
I'm having trouble with the Split function in onshape. Basically, I have a large ring-shaped part that I want to split in 6-8 segments to make them manageable for our 3d printer. I want the split to have a sort of jigsaw-puzzle shape so that I can assemble the printed ring segments more robustly. To achieve that I thought of doing the following : 
1-create a spline sketch of an arbitrary shape in a plane parallel to my part
2-extrude that sketch into a surface along the axis of the part 
3-Use this surface as a split tool ("Entity to split with")

Here's an image that I think illustrates what I want to do : 

However, this operation always returns the error message : "Split 2 did not generate properly : tool entity cannot split the selected part". I haven't found anything online about this particular error message, and I don't see any obvious explanation as to why it wouldn't work. I should specify that the part I'm trying to split is an import from Solidworks.

Any help would be greatly appreciated,


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