Once I moved my printers around and could access the back easily, the poop chutes I'd been using didn't work anymore. I figured that dropping the poop straight into a bin would be the easiest way to collect it. Luckily, others have been doing the same thing and I was able to make a few changes to @Ceppeto's chute to suit my needs. I shortened the exit, and added extra/bigger magnet holes, and made sure the end would fit inside some 2 ½" dust collection tubing I had sitting around. As I was wanting to dump both printers in one container, also made a angled flume to toss the poop from both into a single bucket.

All you need for 1 chute is 6 10x3mm magnets and a length of 2 ½" OD dust collection tubing like this. If you don't have the hose clamps, zip ties will work just fine. Then hang the tubing into what ever collection container you want. For the dual chute I used 5 12x3mm magnets; I've included the STEP file so it can be modified to use whatever mounting solutions you need.

For anyone who thinks that the inner ribs might cause a clog; it's 2 ½" wide through there. The size of the rib space is smaller than the diameter of a typical poop coil, and they are angled down anyway. The material is a very slick PVC. The hose is designed to prevent sawdubst from clogging it. I've been printing a week with this setup and have yet to see a single piece of poop hang up in the tubing.

I printed this in PETG with 3 walls and 15% gyroid infill and tree supports. It should work OK with your own choice filament and standard settings. The flume prints well with the magnet holes up with no need for supports.