HAFC V2 - Hackman Automatic Filament Cutter V2

About the model

HAFC V2 – Hackman Automatic Filament Cutter by Hackman3D Here's a link to get the necessary hardware. No partnership or affiliation involved, but since the price is reasonable, I haven't asked for a commission. HAFC Aliexpress Pack back in stock : https://a.aliexpress.com/_EH25h7a Video in use, sorry it's on a Bambu printer, I work on an holder for my prusa mini https://www.youtube.com/shorts/-0ykCtMGRbw?feature=share 🧠 Concept & Purpose The HAFC V2 (Hackman Automatic Filament Cutter) is a fully mechanical system compatible with any FDM 3D printer using 1.75 mm filament with a PTFE tube. I designed it to solve a very common issue: filament getting stuck on the spool (tangles, friction, jammed spool…). Instead of forcing the extruder: •filament tension increases •the mechanism triggers •the filament is cleanly cut •the printer pauses thanks to its filament runout sensor 👉 You just reload filament and resume the print No electronics, no sensors involved — everything is passive, simple, and reliable. ⸻ ⚙ What’s new in V2 This version is based directly on feedback from V1. The main focus was improving reliability and behavior: •more compact design •faster to print •improved tolerances (filament path + internal sliding) •added return spring → automatic reset •stronger resistance to reduce false triggers •improved magnet alignment •possibility to add extra magnets externally to fine-tune trigger force The result is a more stable and predictable system, even on very precise machines. ⸻ ⚙ How it works The filament goes through the HAFC using a PTFE tube and Pneufit connectors. If the spool gets stuck: •tension increases •the sliding module moves •the blade cuts the filament ➡ The printer detects filament runout and pauses automatically Magnets control the trigger force, and the spring resets the system after activation. ⸻ 🖨 Printing •PLA or PETG recommended •supports already included in the 3MF / G-code Basic settings work fine: •0.2 mm layer height •3 walls •20–30% infill ⸻ 🔩 Required hardware Mechanism •2 × M6 Pneufit (good quality recommended) → cheaper ones may have an internal lip that restricts filament movement → Bambu Lab ones work perfectly •1 × Bambu Lab cutter blade for X1/P1/A1, No P2S •1 × spring (0.3 × 6 × 80 mm) •3 to 5 × 8×2 mm neodymium magnets Screws •2 × M3×20 •1 × M3×12 ⸻ ⚠ About Pneufit installation When installing the Pneufit on the moving part: 👉 the plastic might crack slightly This is normal and does not affect functionality. It depends on your printer tolerances and filament. ⸻ 🛠 Assembly ⸻ 🔧 Adjustment Depending on your print, you may need to: •slide the mechanism manually a few times •“break in” the contact surfaces This improves smoothness. Some users added a bit of grease on V1 — still an option if needed. ⸻ 🔄 Compatibility •all FDM printers •1.75 mm filament •PLA / PETG / ABS / TPU ❌ not compatible with 2.85 mm ⸻ ⚠ Important The HAFC does not replace a filament runout sensor. It works before failure happens, by intentionally cutting the filament to prevent a failed print. ⸻ ❤ Support If you use the HAFC V2: •leave a like •post a make •share your feedback 👉 that’s what helps improve the project ⸻ 💬 Creator note V2 fixes the main issues reported on V1: triggering, smoothness, and tolerances. Thanks to everyone who tested and shared feedback 🙌 The future versions will depend on the community. // hidden signal detected If you’re reading this… you’re not supposed to A small batch of 8 HAFC V2 kits is being dropped to selected makers. No public giveaway. No announcements. Just builders who: • create • share • push the project further If that’s you… you know what to do. 📩 Send proof of your posts (any platform) in DM. Selection will be random… but only among those helping the HAFC grow. // end of transmission Instagram link for the giveaway : https://www.instagram.com/p/DWuOL7CDnDu/?utm_source=ig_web_copy_link&igsh=MzRlODBiNWFlZA==