Trying to cut off the corner of a solid, using a plane not parallel or at right angles to any of the faces. how to define direction?
I assume you're trying to use an Extruded Cut to accomplish this? If yes, you're required to select a direction for the extruded cut when using a 3d sketch. I selected the edge shown below, but an edge perpendicular to it would probably work just as well.
By the way, some users may not be aware of it, but you can use that box for extruding or extrude cutting using a 2d sketch also. If you leave that box blank then those features will be perpendicular to the sketch plane, but you can have them go at an angle if you want.
Retrieving data ...