Why I CHANGED the Poop Chute on my Bambu Lab P2S!

Why I changed the “poop chute” on my Bambu Lab P2S

Context / tech concept

Bambu Lab printers (including the P2S) purge filament during calibration and color changes by extruding small blobs/balls of filament — commonly called “poop.” That waste is routed out the back and needs a catch or chute to avoid messes and machine errors.

Problem: with multi‑color prints there are frequent purges. Hot filament blobs can stick inside a chute, build up, and cause jams or a “full of poop” error that stops prints.

Original chute (previous design)

The author’s original printed chute (PLA) worked, but had key shortcomings:

• Narrow, slanted shape allowed hot purge blobs to stick mid‑chute → buildup/“constipation” → stopped prints.
• Limited capacity → occasional overflow and filament on the floor.
• Some geometry risked blocking rear fans (this was later fixed in other versions).

New chute (what he switched to)

Switched to Chris1974’s “version 2” poop shoot.

Wall thickness / print options:

• 1.6 mm walls — sturdier, ~5 hours to print, ~267 g filament (what he printed).
• 0.8 mm walls — faster, ~2.5 hours to print, ~130 g filament.

Observed benefits:

• Much larger internal volume — significantly less frequent emptying; handles long multi‑color prints.
• Geometry prevents back‑up and does not block rear fans.
• Sits against the printer side and catches many more purge blobs (demonstrated on camera).

Practical notes, tips and analysis

• Cause of sticking: purge blobs are still hot and can adhere to chute walls. Surface coatings (e.g., tape) can help, but improved geometry and increased volume are more robust fixes.
• Use case: if you run long prints unattended (overnight or while away), a larger-capacity, anti‑clog chute reduces the risk of stopped prints and messy cleanups.
• Tradeoff: the larger/sturdier print uses more filament and longer print time but reduces maintenance and cleanup effort.
• The author demonstrates actual purge blobs and color transitions to show why volume and shape matter.

Resources / guides mentioned

• Previous video: “top 10 / first 10 prints” to do on a new Bambu Lab printer (referenced).
• This video functions as a short guide/review comparing chute designs and explaining why he replaced his original.
• The channel contains a 3D printing playlist and other tutorial videos.

Main speakers / sources

• Ernie (PaleoMaker MD) — video author / presenter.
• Chris1974 — designer of the replacement “version 2” poop shoot.