There were no rules about pens at the schools I went to. In high school I used Parker Vector (http://www.parkerpen.com/en/discovery/range/performance/vector) pens—cheap enough that I could afford to buy them, but pleasant to write with. I also had a rotring isograph (http://www.rotring.com/en/produkte/technisches_zeichnen/isograph.html) for drawing graphs and diagrams. If you're an engineer type it's natural to be interested in the tool you're using, and if you do a lot of handwriting then that's your pen (just as if you do a lot of typing then you pay attention to your keyboard).
In those days rollerballs were only just starting to get good, so if you wanted a pen that was more pleasant than a ballpoint then it had to be a cartridge or fountain pen. But now rollerballs are good enough and I use Pilot Hi-tecpoints (http://www.pilotpen.eu/index.php?id=195&tx_ttproducts_pi1[pid]=195). When I write at all, that is, which is very rarely now.
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In those days rollerballs were only just starting to get good, so if you wanted a pen that was more pleasant than a ballpoint then it had to be a cartridge or fountain pen. But now rollerballs are good enough and I use Pilot Hi-tecpoints (http://www.pilotpen.eu/index.php?id=195&tx_ttproducts_pi1[pid]=195). When I write at all, that is, which is very rarely now.