This allows you to buy 20x36 sheets of foam core or corrugated plastic and hang them for better ABS printing.

20x36 would be ideal but 20x30 is easy to find.

https://www.michaels.com/corrugated-board-by-creatology/M10567770.html?dwvar_M10567770_color=Black#q=corregated%20plastic&start=2

Category: 3D Printer Parts