The axidraw from evil mad scientist is also a great gateway and super hackable, though generally more expensive than a vintage hp plotter you can find on ebay.

The axidraw from evil mad scientist is also a great gateway and super hackable, though generally more expensive than a vintage hp plotter you can find on ebay. https://shop.evilmadscientist.com/productsmenu/846 https://shop.evilmadscientist.com/productsmenu/846