This is an ACME style pegbar used for creating 2D animation. Zagudabuda's remixed pegbar was pretty much perfect, but it was too wide for my A8. So, I brought the sides in a little bit, bringing it down to 215mm across, to let it print on my bed (I later realized the original would've printed just fine if I forewent a skirt, but I've already made the model and I'm sure it's useful to someone, so.... whatever). There was also some kind of anomaly that essentially ruined the center peg when I imported the design into tinkercad, so that ended up being completely redesigned.