Fits pretty good inside the "Yashee" brand cereal boxes from Amazon, however I'm not super happy with the spool rolling performance. I've noticed quite a bit of friction, probably not that much to cause major issues for day to day printing, but with more rough filaments it might be problematic. I think it's not a problem with this model by itself, but rather with the overall approach where the spool sits at the bottom of the box and rollers, rather than sits at the shaft put in the middle of the spool (like the linked model from "ktpanda"). I've also encountered a problem with spools compatibility. Prusament spools were fine, but a bit narrower spool from Fiberlogy was nearly touching the bearings. Even smaller spools (300 gram spools from Rosa3D or DevilDesign) didn't fit at all, since one side of the spools sits in the middle, which has different geometry preventing it from spinning freely. So, overall, a nice design, but unfortunatelly not universal and robust enough to my liking. (edited)
