Note that the reason we are using 2.9 and not 3 mm for the offset, is that in the case where two paths are right next to each other, there needs to be a tiny amount of material between them otherwise the area will be combined together. Since our groove will be 6 mm wide and 3 mm deep, we will create the extrusion profile by offsetting the paths by 2.9 mm each side of each path and then joining the ends.The reason I want a triangle shaped groove is that you will get the cleanest 3D print with 45 degree overhangs without having to use any supports To create the grooves in the cylinder face, we are going to use a simple extrude command, and using an angle in the cut will give us a triangular profile for the groove.Remember that we added a 0.5 mm flat plane to allow us to unroll the cylinder, so make sure that any lines that cross the edges are extended so they go right to that edge. At this point you can go ahead and add all the false paths, or even a second 'right' path if you wanted to have that option.I've also included a small horizontal length at the bottom which will help lock the box together I'm keeping the last path 6 mm from the bottom of the cylinder to account for the fact that the pin will be below the top edge of the cap.Starting at the top edge create your path using a series of lines. Create the 'right' path that will allow you to unlock the cylinder.This means the width of the path at the surface needs to be 6 mm so I set that to the grid size to make it easier. note that in this case I want to use a groove that is 3 mm deep, and has a 45 degree angle on the sites. If you like, you can edit the grid settings to help make things line up and by turning on the snap to grid.Create a sketch on top of the exterior side of the flattened cylinder and this is where we will create the maze.If you try and do an Unfold at this point, you will get an error, but since we have our earlier Unfold command captured in the timeline, simply move the timeline marker to just after the unfold command and you will see the cylinder open up again.Click OK and the cylinder should be complete Select the two opposite faces and make sure that Join is selected in the Operations menu.Switch the top tab from Sheet Metal to Solid, and select Loft from the Create menu
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