Someone seriously patented purge towers? Ffs, first hearing that 3D printers were shelved for decades because some douchy company camped on the main patent, and now shit like this? Patenting "printing a square tower to accommodate the waste created during filament swaps" is fucking ridiculous. I can't stand patents anymore. Corporate extortion through and through.
Fuck Stratasys.
Or on a Bambu, just do a longer "poop" purge and spit it out the side like they already do. A tower isn't even necessary. It's only needed on devices without a purge capability. I've printed plenty of multicolored prints without any tower whatsoever on mine. Literally should be suing anyone but Bambu for that one.