i made it for my own pen sharpener but i believe most of the very standard ones are pretty much the same

you can tweak the adjustment of the top cover by making it larger or narrower in the .sldprt file that is in the .zip (the one i printed is a bit loose, but it isn't really a problem)

the gcode file with print time, plastic length and weight is for an ultimaker² in normal printing settings

it might look big, and it is pretty hard to fit in my small pencil case, BUT, all that is because i wanted it to be support free, so it had to have 2 reservoirs while the sharpener only leave shavings on one side
and i made it really quickly from a basic concept

(honestly, print it only if you didn't find better, i'm not that proud of it...)