I designed the template on Illustrator and then cut all the pieces by hand out of thin cardboard, using scalpels and a compass cutter for the circular holes. My main interest in this kind of construction is that the pieces go together with no glues, and can be taken apart if needed. Using this technique and a cheap readily available material like cardboard means parts can be easily replaced if damaged. The tidy holds 20 pencils, 10 fineliners, some sharpeners and some erasers.
Anyway, it definitely works as a desk tidy, and only time will tell if we go through any less pencils... I'm intending to make myself a few variants of this in the future. I would really like somewhere to store my knitting needles in size order. Yeah, I'm that cool.