1. 12V/24V Miniature Pencil Heater for 3D Printers & Medical Devices
Hongtai Miniature Pencil Heaters pack high thermal energy into the smallest possible footprint. Designed for the precise requirements of 3d printer heater cartridge replacements (compatible with Voron, Prusa, Creality) and portable medical devices, these 12v cartridge heater units deliver rapid heating up to 350°C+ despite their compact size.
Manufacturing a pencil heater with diameters as small as 3mm requires microscopic precision. We use premium imported MgO and ultra-thin Ni-Cr wire to ensure reliable performance. Special attention is given to the lead wires, using high-amperage Teflon insulation to prevent overheating in low-voltage/high-current applications.
2. Key Technical Features
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Micro Size: Diameters starting at 3mm, 4mm, 5mm, 6mm (1/8″, 5/32″, 1/4″).
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Low Voltage Optimized: Engineered specifically for 12V DC and 24V DC power sources.
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High Current Leads: Heavy-gauge Teflon (PTFE) wire prevents melting under high amperage loads (5A+).
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Rapid Heat Up: High watt density concentrates heat for fast extrusion or fluid warming.
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Precision Fit: Ground to -0.02mm tolerance for standard heater blocks (e.g., E3D V6, Volcano, Mosquito).
3. Technical Specifications
| Parameter | Standard Specification | Customizable Options |
| Diameter | 3mm, 4mm, 6mm, 1/4″ (6.35mm) | Custom Micro Sizes |
| Standard Lengths | 15mm, 20mm, 30mm, 40mm | Custom Length |
| Voltage | 12V DC, 24V DC | 48V DC |
| Wattage | 30W, 40W, 50W, 60W, 70W | Custom (Check Amp limit) |
| Lead Wire | 1 meter Teflon (PTFE) | Connector (Molex/Dupont/JST) |
| Tolerance | -0.02mm (H7 Fit) | – |
| Max Temp | 350°C (Standard) | 500°C (High Temp Version) |
4. High Current Safety (12V vs 24V)
In low voltage systems, current (Amperage) is the primary safety concern.
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The Physics: A 60W heater running at 12V draws 5 Amps. Standard thin leads would melt or cause a voltage drop.
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Hongtai Solution: We utilize thicker gauge, multi-strand internal leads with high-temperature Teflon insulation. This handles the current load safely, ensuring your 3d printer heater cartridge reaches the target temperature without burning the wires.
5. Applications
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3D Printing: FDM/FFF Hot ends, heated beds.
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Medical Devices: Portable blood analyzers, fluid warmers.
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Soldering: Micro soldering irons.
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Aerospace: Component testing in compact chambers.
6. FAQ
Q: Is this compatible with the E3D V6 hotend?
A: Yes. The standard E3D V6 uses a 6mm diameter x 20mm length cartridge. We stock this size in both 12V 30W/40W and 24V configurations.
Q: How do I PID tune this heater?
A: Because our heaters have high thermal conductivity, they heat up very fast. You must run a PID Autotune command (M303 in Marlin/Klipper) after installation to prevent temperature overshooting.
Q: Can you add a connector?
A: Yes, we can pre-terminate the leads with Molex Micro-Fit, JST, or Dupont connectors to plug directly into your printer’s mainboard.
