Lydia SJ30 — Production-Grade Open-Source Extruder
Flexible, robust bench-top extruder built for continuous production of beams, profiles, and filament at 5–20 kg/h. The SJ30 is the workhorse of the Lydia family.
Features
- Electronic auto-feed system — ensures consistent flow of plastic flakes into the barrel
- Remote control and monitoring via Modbus (Omron PIDs + Delta/Sako/Omron VFD)
- Interchangeable flanges for beams, profiles, and injection moulding
- Heavy-duty cart for workshop mobility
- Advanced web interface for temperature, speed, and process monitoring — see more
- Hardened alloy barrel with liquid cooling section
- Quick-release hopper with shutoff valve, venting port, stainless construction, and auto-feed
- Supports HDPE, PP, LDPE, PET, ABS, PLA, PETG, and PEEK
| Spec | Value |
|---|---|
| Model | Lydia SJ30 |
| Version | 4.5 (Extended) |
| Screw ø | 30 mm |
| Screw features | Mixing + shearing section |
| Screw material | 38CrMoAlA |
| Barrel ø | 50 mm |
| Barrel length | 80 cm |
| Usable screw length | 710 mm |
| Barrel material | Hardened alloy |
| Barrel flange | Shutoff-valve slider, 120 mm – M10 × 10 |
| Barrel features | Liquid cooling section |
| Barrel interface | M40 – 2.0 |
| Hopper features | Quick release / shutoff valve / vent port / stainless / auto-feed |
| Max. temperature | 350 °C |
| Heating power | 2.2 kW |
| Heat elements | 6 × ceramic (3 heat zones) |
| PID controllers | RexC-100 or Omron E5 (Modbus) |
| Axial tolerance | ± 0.05 mm |
| Back-pressure handling | Up to 5 T (2 thrust + 1 taper bearing M35) |
| Max. output pressure | 5 T |
| Noise | 45 dB |
| Motor power | 3–4 kW |
| Gearbox ratio | 1 : 15 – 1 : 30 |
| Drive | Hyundai / Omron / ABB / Sako / Delta |
| Voltage | 220 V / 380 V |
| Output | 5–20 kg/h |
| Supported materials | HDPE, PP, LDPE, PET, ABS, PLA, PETG, PEEK |
| Input flake size | Small – Medium |
| Weight | 140 kg |
| Package dimensions | 120 × 100 × 450 cm |
| License | CERN Open Source Hardware License |
PolyMech Design - Research Project
Lydia Extruder Family
| Model | Price | Screw ø | Barrel length | Motor | Voltage | Output | Weight |
|---|---|---|---|---|---|---|---|
| Lydia SJ25 (Robot Printhead) | € 4 500 | 25 mm | 42 cm | 1.5 kW | 220 V | — | 35 kg |
| Lydia SJ25 | € 2 400 | 25 mm | 42 cm | 1 kW | 220 V | — | 35 kg |
| Lydia SJ30 | € 4 554 | 30 mm | 80 cm | 3–4 kW | 220 / 380 V | 5–20 kg/h | 140 kg |