Upgraded 0.4MM Kobra S1 Hotend with Ceramic Heating Rod, New Thermistor Prevents Fracture, S1 Extruder Hotend Hardened Steel Nozzle, Rapid Replacement for Anycubic S1 3D Printer Nozzle Kit(2PCS)
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Availability:
In Stock.
Arrives
Tuesday, Jun 16
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Style: 2Pcs 0.4MM Hotend
Features
- Upgraded Ceramic Hot End with Hardened 200K Thermistor: This upgraded ceramic hot end is specially designed for use with Kobra S1 printers. Featuring a hardened 200K thermistor and protective sleeve, it offers more precise temperature readings and longer lifespanperfect for users upgrading from standard S1 combo hotends
- Rapid-Heating Ceramic Heating Head 3X Faster Startups: Thanks to high thermal conductivity, this ceramic heating head reaches 220C in just 38 secondsthree times faster than stock components. A must-have among ceramic hot end for Kobra S1 upgrades, ensuring less downtime and quicker print starts
- Green Silicone Sock Thermal Stability with Visual Clarity: This S1 combo nozzle kit includes a green silicone sock that enhances thermal insulation and improves visibility around the nozzle. It protects from filament build-up and complements other compatible Kobra S1 accessories for a cleaner workspace
- Leak-Free, High-Speed Printing up to 600mm/s: Built with all-metal materials and a hardened steel Kobra S1 combo nozzle .4, this unit withstands up to 320C. Engineered for fast, reliable extrusion with zero clogging or leakingcompatible with 1.75mm PLA, ABS, PETG, TPU, and more
- Easy Installation Compatible with Anycubic Kobra S1 Combo: Fully compatible with and designed for use with Kobra S1 Combo printers. This plug-and-play replacement kit includes 2x upgraded ceramic hotends, 0.4mm nozzles, and green silicone coversideal as hardened 200K hotend for Kobra S1 Combo users seeking performance and style
- Special Attention: It is recommended that PID calibration is not required for this product; instead, you can appropriately increase the printing speed or lower the printing temperature for printing.When calibrating the PID of our upgraded Kobra S1 hotend, an error may occur. This is because we have upgraded the heating rod to a ceramic heating plate, whose heating efficiency has been significantly improved and exceeds the reasonable range of the heating rod algorithm, thus causing the error
Description
Bulto Upgraded 0.4MM Kobra S1 Hotend with Ceramic heating rod, New Thermistor Prevents Fracture, S1 Extruder Hotend Hardened Steel Nozzle, Rapid Replacement for Anycubic S1 3D Printer Nozzle Kit(2PCS)
Package Dimensions: 2.44 x 1.46 x 0.47 inches
Item Weight: 1.44 ounces
Manufacturer: Bulto
Date First Available: June 14, 2025
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Jun 16
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Style: 2Pcs 0.4MM Hotend
This upgraded 0.4mm hotend for the Kobra S1 has been a nice improvement over the stock one. The ceramic heating rod heats up quickly and keeps temps stable, which helped with more consistent prints. The updated thermistor design is a big plus too—it feels more secure and less prone to breaking compared to the original setup. Installation was straightforward and everything fit without issues. Print quality has been reliable with smooth extrusion and no clogs so far, especially with PLA and PETG. Only downside is you might need to tweak your temperature settings a bit after installing, but nothing major. Overall, a solid, affordable upgrade if you want better reliability and more consistent performance out of your printer.
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Reviewed in the United States on April 24, 2026 by Ewrawr
Style: 2Pcs 0.4MM Hotend
This works with my Kobra S1 just fine. Printed roughly 60 or 70 hours with this thing with no issues whatsoever. I also appreciate the fact that it's a hardened steel nozzle versus the standard. Have not tried printing abrasive filaments yet, but printing fine with PLA and petg. Make sure you run a full calibration after installing this.
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Reviewed in the United States on April 30, 2026 by J. Burt
Style: 2Pcs 0.4MM Hotend
This is one of the nicest aftermarket hotends for the Kobra S1 I've found, it heats up super quick, I was at 220°C at around 8 seconds, and the print quality is fantastic, definitely will be buying more of these to keep on hand.
Reviewed in the United States on September 6, 2025 Reviewed in the United States on September 6, 2025 by Harlyn
Style: 2Pcs 0.4MM Hotend
Great hotend heats up super fast, doesn't clog, remember to retune PID.
Reviewed in the United States on January 23, 2026 by kpkenx
Style: 2Pcs 0.4MM Hotend
Hot end seems to clog instantly. Flow control is fine. Heats up fast but clogs instantly. Not sure if this is a heat creep issue or if the nozzle just doesn't get as hot as the block. Almost no thermal paste, but smart result as when I added new paste. Fits well, heats fast, clogs like crazy.
Reviewed in the United States on September 28, 2025 by Christopher T. Tefer
Style: 2Pcs 0.4MM Hotend
I bought these Hot ends for my Kobra S1 a few weeks ago. Finally had to replace the hotend a few days ago and installed one of these... I recalibrated the printer and can report everything is still printing perfect... (knock on wood ;))
Reviewed in the United States on May 22, 2026 by Tom M.
Style: 2Pcs 0.4MM Hotend
They wear out quickly. Then again, my printer is running over 100 hours a week so there's that...
Reviewed in the United States on December 21, 2025 by Banes Bane
Style: 2Pcs 0.4MM Hotend
Have not used but good price for a backup hotend
Reviewed in the United States on April 25, 2026 by Robert Bird