E3D Revo hotend: max temp, thermistor, flow and nozzles

The E3D Revo is rated to 300 °C out of the box, reads temperature through an ATC Semitec 104NT-4-R025H42G thermistor built into its HeaterCore, and flows 13 mm³/s in PLA through a standard 0.4 mm brass nozzle by E3D’s test. Each Revo nozzle is a nozzle and heat break in one part, so it is swapped by hand below 50 °C. Higher temperature, higher flow and abrasion resistance come from changing the nozzle or the hotside, not the whole hotend.

What is the max temperature of the E3D Revo?

The E3D Revo’s max temperature is 300 °C with E3D’s standard 40 W or 60 W HeaterCore, whose Semitec thermistor is rated to 300 °C. E3D’s High-Temperature Hotside raises the limit to 400 °C with a 40 W heater or 500 °C with a 65 W heater. It needs a PT100 or PT1000 sensor and nozzles rated that hot.

The lowest-rated part in the hot zone sets the ceiling:

• Sensor. ATC Semitec rates its NT-4 glass thermistors from −50 to 300 °C. The thermistor sits inside the HeaterCore, so raising the firmware limit does not make a HeaterCore safe past 300 °C.
• Heater. E3D rates both HeaterCores to 300 °C. For the High-Temperature Hotside it offers a standard heater cartridge “up to 400°C” or a high-temperature one “up to 500°C”.
• Nozzle. Brass, High Flow brass and ObXidian Revo nozzles are rated to 300 °C. HT, HTA (high-temperature abrasion-resistant) and ObXiDian 500 nozzles are rated to 500 °C. In a 40 W or 60 W HeaterCore they stay limited to 300 °C, as E3D notes for HT and HTA.

A High-Temperature Hotside also needs a new sensor type in firmware (see the Klipper config below). Raise the firmware maximum only once every part is rated for it (firmware temperature limits). Running past a printer maker’s own limit is at your risk and can affect the warranty (does upgrading void the warranty).

What thermistor type does the E3D Revo use in Klipper?

The standard E3D Revo HeaterCore uses an ATC Semitec 104NT-4-R025H42G 100k thermistor, which Klipper has built in as sensor_type: ATC Semitec 104NT-4-R025H42G. The Revo CR and Revo Creality Sprite HeaterCores use a Creality 100k thermistor instead, so those keep the printer’s stock Creality sensor setting.

E3D’s 40 W Creality HeaterCore support page repeats the 104NT values, but its store listing and Revo CR page specify a Creality thermistor (Marlin type 1), which is why a Revo CR runs on stock Creality firmware. The 60 W HeaterCore uses the same thermistor as the 40 W one, so switching between them changes no sensor setting.

E3D Revo Klipper config

These are the [extruder] lines that change for a standard Revo HeaterCore, set to E3D’s sensor and its 300 °C rating. Every option is described in Klipper’s configuration reference.

[extruder]
# Keep your existing stepper, nozzle_diameter, filament_diameter and heater_pin lines.
sensor_type: ATC Semitec 104NT-4-R025H42G
sensor_pin: YOUR_THERMISTOR_PIN   # your board's extruder thermistor input
#pullup_resistor: 4700            # Klipper's default, the 4.7k pullup E3D specifies
control: pid
# Keep your current pid_Kp, pid_Ki and pid_Kd until PID_CALIBRATE replaces them.
min_temp: 0
max_temp: 300                     # E3D's maximum for the HeaterCore

Then:

1. Tune the heater. Run PID_CALIBRATE HEATER=extruder TARGET=240, then SAVE_CONFIG. E3D says to PID tune (re-tune the heater’s control loop) after any hotend change, including a move to the 60 W HeaterCore. It suggests tuning at 200 °C if you print mostly PLA, or at 240 °C for 200 to 280 °C.
2. Leave headroom under max_temp. Klipper shuts down if the measured temperature leaves the min_temp to max_temp range, so print a few degrees under 300 °C.
3. Raise nozzle_diameter for big nozzles. Klipper caps each extrusion’s cross-section at 4 × nozzle_diameter² unless you set max_extrude_cross_section: 0.64 mm² with 0.4 entered. A 1.2 mm nozzle printing 0.6 mm layers 1.5 mm wide (E3D’s test lines) needs 0.9 mm², and Klipper returns an error. Update nozzle_diameter when you swap, or set the cap for your largest nozzle.
4. Keep heater verification on. E3D says the HeaterCore’s PTC (positive temperature coefficient) design cuts power as it heats, which lowers the maximum thermal runaway temperature. That does not replace Klipper’s own check (Klipper heater verification).

On a High-Temperature Hotside the sensor line changes to sensor_type: PT1000 for a directly connected PT1000 (4.7 kΩ pullup). E3D says the PT100 versions need an amplifier board if your printer does not already use PT100 sensing. Klipper then takes the amplifier’s type, such as MAX31865. Set max_temp no higher than the hotside’s rating.

What is the max flow rate of the E3D Revo?

On a 60 W HeaterCore, E3D rates the standard 0.4 mm brass Revo nozzle at 13 mm³/s in PLA, 17 mm³/s in PETG and 15 mm³/s in ASA. Its 0.4 mm High Flow brass nozzle reaches 16, 27 and 26 mm³/s, and the 1.2 and 1.4 mm High Flow sizes top out at 52 mm³/s in ASA.

E3D’s test conditions:

• Hardware. A 60 W Revo HeaterCore on an E3D Hemera XS extruder, every print on the same motion system.
• Test part. A single-wall vase-mode part sliced in PrusaSlicer 2.4.2, at 100% part cooling.
• Line size. Layer height 50% and line width 125% of the nozzle diameter, so 0.2 mm and 0.5 mm for a 0.4 mm nozzle.
• Filament. Prusament Jet Black PLA, PETG and ASA, dried for at least an hour at 60 °C.

E3D warns that your extruder, filament and settings move the result, and that not every extruder can match the Hemera XS. In CNC Kitchen’s March 2022 review, a standard 0.4 mm Revo finished a PLA meander test at 16 mm³/s with the nozzle set to 210 °C. E3D says you may need the 60 W HeaterCore to print PC, ABS or nylon through a 0.8 mm or larger nozzle. Set the slicer’s maximum volumetric speed below your nozzle’s figure in the table.

How do you change a nozzle on the E3D Revo?

To change a nozzle on the E3D Revo, unload the filament and let the hotend cool below 50 °C. Then unscrew the nozzle by hand and screw the new one in finger-tight. E3D says to use no tools and no hot-tightening, because each Revo nozzle includes its own heat break. Check the Z offset before the next print.

1. Unload the filament. Heat to the filament’s printing temperature and unload it. Because the nozzle is removed cold, the filament must be out of it before you start. CNC Kitchen suggests adding a retract to your end G-code so the nozzle is empty after every print.
2. Cool below 50 °C. Turn the heater off and wait until the hotend reads below 50 °C, E3D’s limit for a nozzle change. E3D’s nozzle guidance says room temperature, to avoid burns.
3. Unscrew the nozzle by hand. Turn it out with your fingers, without pliers or a wrench. The HeaterCore stays held by its spring.
4. Screw in the new nozzle finger-tight. It should slide freely through the HeaterCore into the heatsink. Do not hot-tighten it. If you turn the HeaterCore to route its cables, turn it counterclockwise only: E3D says turning it clockwise disengages the spring.
5. Check the Z offset. E3D makes every Revo nozzle to the same length within ±0.2 mm, so the probe and bed leveling stay as they are. It says you may still need to adjust the Z offset for a good first layer (Z offset at temperature).
6. Update the slicer and firmware. Set the new nozzle diameter and its flow limit from the table above, and in Klipper update nozzle_diameter. E3D says ObXidian nozzles print with the same profile as brass.

ObXidian vs standard brass Revo nozzle: what is the difference?

ObXidian is E3D’s abrasion-resistant Revo nozzle: a copper-alloy body around a tool-steel insert, finished with E3DLC, E3D’s diamond-like carbon coating. Brass is not abrasion resistant. Both are rated to 300 °C and flow about the same, and E3D says ObXidian uses your brass slicer profile with no temperature offset.

Prices are for 0.4 mm nozzles, checked on October 30, 2026. E3D’s limits on ObXidian:

• Not every filler. E3D names Polymaker’s Fiberon range and its PolyMide PA612-CF, PA6-CF, PA6-GF and PA12-CF among fillers that cause significant wear even on ObXidian.
• Small nozzles clog. Filler particles can approach 0.4 mm, so check the filament datasheet’s minimum nozzle size. E3D does not recommend abrasive filament through 0.25 mm nozzles.
• Cleaning. E3D approves cold pulls, warm pulls, nylon cleaning filament and a brass brush on ObXidian. Isopropyl alcohol (IPA) or acetone will not harm the coating, it says. It advises against needles, steel wire brushes and a blow torch on any Revo nozzle.

When to use a hardened steel nozzle lists which filaments need one, and the wear-resistant nozzle comparison compares ObXidian with other materials.

Is the E3D Revo worth it?

Five conditions decide it, each with the numbers:

• You change nozzles often. E3D advertises tool-free changes in under 60 seconds. CNC Kitchen went from changing nozzles “maybe once every other month” to picking one for every print. It expects little gain if your printer works and you always use the same nozzle. Counting the unload and cool-down, it judged a hot nozzle swap on a V6 might even be quicker.
• Cost per nozzle. A Revo nozzle includes its heat break, and it costs more. At Printed Solid on October 30, 2026, a Revo brass nozzle was $24.85 against $6.85 for an E3D V6 0.4 mm brass nozzle. A Revo ObXidian was $52.80 against $19.85 for an E3D V6 hardened steel nozzle.
• Flow. A standard 0.4 mm brass Revo nozzle is rated at 13 mm³/s in PLA. High Flow nozzles fit the same hotend and reach 16 to 37 mm³/s in PLA. Filastruder lists the 24 V 60 W HeaterCore at $34.99 and the 40 W at $27.99.
• Heat. The HeaterCore stops at 300 °C. Above that you need a High-Temperature Hotside (PT1000 version without a nozzle at West3D: $79.99 for 400 °C, $119.99 for 500 °C). You also need a firmware sensor change and 500 °C-rated nozzles.
• Part cooling. CNC Kitchen measured a Revo’s melt zone dropping from 206 to 197 °C with the part-cooling fan on. It suggests adding 5 to 10 °C when reusing existing profiles.

Revo Six, Revo Voron, Revo Micro and printer kits: what differs?

Every Revo takes the same nozzles and HeaterCores; the variants differ in the heatsink and mount. E3D now sells each one as a cold side plus a hot side, and its old Revo Six, Revo Micro and Revo Voron product links open a configurator. In the US on October 30, 2026, West3D listed the Six, Prusa MK3, Prusa Mini, Creality, Creality Sprite and Voron cold sides at $37.99 each. Its Starter hot side (a 40 W HeaterCore and two brass nozzles) was $49.99. Filastruder listed complete Revo Six, Revo Micro, Revo Voron and Revo Creality hotends at $79.99. Choose the 12 V or 24 V version to match your printer’s power supply.

Revo Six drops into a V6 mount, but Revo nozzles do not fit V6 heater blocks. E3D’s nozzle compatibility list also covers Revo versions of E3D’s Hemera XS and Micro LGX, the BIQU H2 V2 and Panda, and the Micro Swiss NG. No Bambu Lab printer is on that list. E3D’s Bambu Lab products, such as the High Flow ObXidian HotEnd for the X1 and P1, are complete hotends in Bambu Lab’s own format and take no Revo nozzles.