I needed a poop bin that fitted to the rear of the P1S only. There are plenty of great bins that can fit around the rear and to the side but I don't have space on the side for it to fit. I allowed for magnets (6No 6x3mm) but I have not installed them. I used the emoji to allow some visibility into the bin to check when it starts to fill up. This is my first model, having only got the printer two days ago so there are likely refinements to be made in the future.