How do I draw this in 3d?

[Reinoud]

I've made some more pics of the nozzles. The nozzle on the left is the standard silicone nozzle, the other ones are what I use. Currently I use the shortest one and cut it to somewhat the shape I need.What I want to make is some sort of shim that fits around the uncut nozzle and that helps me to make controlled and consistent cuts.If this works I plan to make a different one for the nozzle in the middle, with different cut guides for other glue jobs.