Filament Y-Adapter

Filament Y-Adapter Introduction Sometimes a simple task can take months. I had been looking for a way to create an adapter that would allow filament to be fed both from the AMS hub (AMS2 Pro and/or AMS-HT) and an external spool. The goal was to keep it compact, efficient, and reliable.   The AMS system is quite sensitive: even a slight resistance in the feed path can trigger an error. So it was critical to ensure a smooth channel for the filament. I tried several designs, kept postponing the project, coming back to it... And finally, the adapter turned out just as I had envisioned it: small, geometrically optimized, and fully functional. Material and Print Tips The primary material is PETG. I recommend printing it with a fine nozzle (I used 0.2 mm) and minimal layer height. Why? Because every layer is essentially a step. The fewer the steps, the lower the resistance for the filament—especially when feeding from an external spool, where there’s no active drive from the AMS.   The file is available in .3mf format — fully preconfigured, but you can always tweak the settings in Bambu Studio to suit your needs. Sure, you can print it with thicker layers and then run some abrasive filaments (like carbon or glass-filled types) through it — they’ll polish the channel after just a couple of prints. But if you care not just about functionality but also aesthetics, the fine layers are well worth it. Assembly and Fittings I used basic, inexpensive fittings to secure the tubes. Took them apart and removed the locking clips with their rubber seals. It’s all pretty straightforward, just don’t lose any parts. I’ve shown the process in earlier videos.   Unlike my previous builds, I decided not to press-fit the locks while cold. PETG behaves dynamically — it heats quickly, cools quickly, and contracts fast. So I gently heated the mounting holes with a hot air gun, applied a bit of XY-2 plastic lubricant, and the locks slipped right in without effort. No vice, no press — just careful