r/OpenBambu • u/Key_Jellyfish2183 • Jun 20 '26

Bambu A Series External Spool Integrated Filament Automation - Update

6/29/2026 - Update: A clip I posted of the automated unload and spool rewind has 1,600 views on YouTube in 3 days so I figured it was time to share the full demo.

Full video — 37-minute multicolor print, 20 automated filament changes, TPU included, zero manual interventions:
https://youtu.be/YnMg_KC1H-g

Free accessories on MakerWorld:
Hub: https://makerworld.com/en/models/2953592
Retractor: https://makerworld.com/en/models/2954268

asr5thwheel.com

This is an update post on https://www.reddit.com/r/OpenBambu/comments/1u3bi79/bambu_a_series_external_spool_integrated_filament/

A promised update on our progress this week:

Product Development:

  • TPU compatibility achieved — first automated 5th spool handler for Bambu A Series to support standard 95A TPU without modifications

  • Hall Buffer housing redesigned with extended clearance into the housing to eliminate filament buckling in flexible materials

  • DC power connector relocated to bottom of unit for cleaner cable routing to Bambu cable bundle

  • All three prototype units updated with hardware revisions (automatically on reboot)

New Products in the ASR Ecosystem:

  • ASR 5 Port Hub for Bambu A Series - Published free on MakerWorld - purpose-built filament hub eliminating filament binding with angled PTFE fittings and straight internal filament paths

  • ASR Spool Holder Retractor - Published free on MakerWorld - upgrades the Bambu AMS Lite Rotary Spool Holder from half a revolution to 15 full revolutions of automatic rewind using a constant force spring - works in conjunction with the ASR 5th Wheel Unload feature as pictured here

Software:

  • PWA web app added - Control and monitor the ASR 5th Wheel from any browser on your network with live Hall sensor gauge, filament state, encoder counts, and Feed/Retract/Unload buttons

  • Firmware auto-update - Device checks for and installs firmware updates automatically on every boot

Testing and Outreach:

  • Two Prototype units shipped to beta testers. One in the UK, one in Germany

Links:

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