FYSETC 220 × 220 mm Magnetic Heated Bed – 24 V with Embedded Magnets

FYSETC 220 × 220 mm, 24 V magnetic heated bed designed to work with a removable flexible spring-steel build plate. The magnets are embedded in the rear of the heated bed, removing the need to install a separate adhesive magnetic base.

It is a practical solution for building or upgrading a 3D printer with an approximately 220 × 220 mm printing area. Once the print has cooled, the flexible sheet can be removed and gently bent to help release the finished part.

Main features

• Brand: FYSETC.
• Rated voltage: 24 V DC.
• Nominal dimensions: 220 × 220 mm.
• Magnetic system: magnets embedded in the rear face.
• Mounting: four corner mounting holes.
• Temperature sensor: pre-installed and wired thermistor.
• Power wiring: pre-installed.
• Printed reference grid.
• Designed for use with a compatible flexible steel build plate.

Required build plate

This heated bed must be used with a flexible steel sheet suitable for magnetic build platforms. The removable sheet provides the actual printing surface and makes it easier to release parts after cooling.

The flexible sheet is not included with this heated bed and is sold separately. A suitable accessory is the 220 × 220 mm smooth and textured PEI flexible sheet.

The heated-bed PCB itself should not be treated as a finished printing surface. The selected sheet will also affect adhesion, first-layer finish and the effective Z offset.

Compatibility

Suitable for 3D printers, custom projects and conversions designed around a 220 × 220 mm, 24 V heated bed. It may fit some Prusa i3-style machines, but matching dimensions alone do not guarantee a direct replacement.

Before installation, check:

• The printer uses a 24 V electrical system.
• The position and spacing of all four mounting holes.
• Available clearance for the bed, terminals and cable outlet.
• The Y-carriage and levelling arrangement.
• The capacity of the power supply and controller heated-bed output.
• The type and electrical curve of the installed thermistor.
• The actual dimensions of the flexible sheet.

The reference to MK3-style designs describes the general concept and format. It does not guarantee direct compatibility with an Original Prusa printer or every printer revision.

Firmware configuration

A thermistor is installed, but its exact electrical curve has not been established in the available documentation. Do not select a generic temperature table without first identifying or verifying the sensor.

• Marlin: set TEMP_SENSOR_BED to the table matching the actual thermistor.
• Klipper: select the correct sensor_type under [heater_bed].
• RepRapFirmware: define the heated-bed thermistor using its correct electrical parameters.

Before heating, verify that the firmware reports a reasonable room-temperature reading. After installation, perform the thermal or PID calibration supported by the firmware and confirm that thermal-runaway protection is enabled.

Installation and safety recommendations

• Check polarity, continuity, resistance and the absence of short circuits before applying power.
• Size the power supply, MOSFET, terminals, connectors and cable cross-section for the actual current with a suitable safety margin.
• Use an external MOSFET only when the controller output cannot safely handle the load with sufficient margin.
• Fit proper strain relief, particularly on moving-bed printers, so repeated movement is not concentrated at the solder joints.
• Recalibrate Z height, bed levelling and the first layer after installation or whenever the flexible sheet is changed.
• Do not handle the heated bed or remove the sheet while they are hot.
• Keep the magnets away from magnetically sensitive objects and take special care around pacemakers or other medical implants.

Minor superficial marks caused by manufacturing, soldering or handling may be present and do not necessarily affect operation.