100 × 100 mm Adhesive Silicone Bed Heater - 24 V, 60 W and 100K B3950 NTC

100 × 100 mm, 24 V, 60 W adhesive flexible silicone heater for bonding beneath a compatible aluminium plate to build a compact heated bed. It is supplied wired and includes a 100K B3950 NTC thermistor with an XH2.54 connector.

Its nominal current is 2.5 A, making it suitable for small printers, test fixtures and custom 24 V projects when the available surface, output capacity and safeguards have been checked.

Features and electrical data

Mechanical and electrical compatibility

It suits a plate with a flat underside offering at least 100 × 100 mm of usable space, without screws, recesses or obstructions in the adhesive area. A printer's advertised build area does not always match the physical space beneath its bed; check the plate, fasteners, cable exit and moving path before purchase.

The 24 V power supply must cover the heater's 60 W load and every simultaneous machine load with adequate margin. A controller's bed output may only be used when its manufacturer confirms that its MOSFET, fuse, terminals and PCB traces can carry at least 2.5 A continuously with margin.

If the output capacity is unclear, an external stage such as the 30 A FYSETC MOSFET module for 12/24 V DC loads can be added. Its nominal rating does not replace correct wiring, fusing or thermal verification.

Installation

1. Offer the heater up beneath the plate before removing the adhesive liner.
2. Check for a cold resistance close to 9.6 Ω, allowing for meter and probe accuracy.
3. Clean, degrease and dry a flat aluminium plate.
4. Bond progressively from one edge without bubbles, folds or stress.
5. Never cut, drill, crease or attempt to reposition the heater after bonding.
6. Add strain relief so bed motion is not transferred to the electrical joints.

Thermistor configuration

The sensor is a generic 100K B3950 NTC. After configuration, compare its cold reading with ambient temperature and verify heating with an independent instrument.

Marlin

With the common 4.7 kΩ pull-up, the initial option for this curve is:

#define TEMP_SENSOR_BED 11

Keep THERMAL_PROTECTION_BED enabled. If bed PID is enabled and the power stage supports this switching method, tune it at the intended working temperature; for example, M303 E-1 C8 S60 runs eight cycles at 60°C.

Klipper

Use sensor_type: Generic 3950 inside [heater_bed]. The correct sensor_pin and heater_pin depend on the board. Once the assembly has been verified, run PID_CALIBRATE HEATER=heater_bed TARGET=60 followed by SAVE_CONFIG.

RepRapFirmware

The curve can be defined through M308 using T100000 B3950; for example, M308 S0 P"bed_temp" Y"thermistor" T100000 B3950 A"Bed". Replace the sensor number and port with those required by your controller.

Protection and commissioning

• Dedicated fuse on the heater supply branch.
• Wires, terminals and connectors suitable for the current.
• Non-resettable thermal fuse in contact with the plate and able to interrupt the heater.
• Firmware thermal-runaway protection enabled and tested.
• Supervised staged commissioning while checking connections, switching stage and sensor reading.

Firmware protection does not replace an independent thermal cut-off. The safe temperature depends on the complete assembly: plate, adhesive, insulation, sensor, wiring and build surface.

This is for you if

• You are building a compact bed with a 24 V supply.
• You have a flat 100 × 100 mm underside available.
• You need an adhesive heater with an integrated B3950 thermistor.

This is not for you if

• Your controller, PSU or wiring cannot support the complete load.
• The usable area is smaller or contains obstructions.
• You need a complete bed: the aluminium plate and build surface are not included.