Prusa I3 MK3S+ Hotend Extruder Assembly J-Head
By Prusa · 3D Printing Accessories & Scanners · 3D Printing · More from Prusa
- V6 0.4 mm nozzle
- 24 V 40 W heater cartridge
- 1.75 mm filament
- Compatible with MK3/MK3S/MK3S+/MK3.5/MK3.5S
- Includes hotend thermistor and PTFE tube
Lowest price seen
$94.99
from $94.99 at Printed Solid · Checked Oct 26, 2026
- Printed Solid $94.99View at Printed Solid
- PrusaView at Prusa
- eBayView at eBay
- AmazonView at Amazon (paid link)
- eBay (used) eBay: used, open-box, refurbishedView at eBay (used)
Stores are listed in a fixed order, never by price or commission. Prices are snapshots. Check the current price with the store.
Summary
A third-party hotend and extruder assembly sold as compatible with Prusa MK3, MK3S, MK3S+, MK3.5 and MK3.5S printers, with a V6 0.4 mm nozzle, 24 V 40 W heater and 1.75 mm filament support. Check the construction before you buy: the “J-Head” name and the “V6” spec describe two different hotend families, and the listing gives no manufacturer, warranty or thermistor details.
Strengths
- Published specs mirror Prusa’s official MK3-series assembled hotend: V6 0.4 mm nozzle, 24 V 40 W heater, 1.75 mm filament.
- Compatibility covers MK3, MK3S, MK3S+, MK3.5 and MK3.5S in one listing.
- Includes a hotend thermistor and PTFE tube, so the basic consumables are in the box.
- Prusa’s official part is fully serviceable, with nozzle, heaterblock, heatbreak, heatsink, collet, PTFE tube, heater cartridge and thermistor sold separately.
Weaknesses
- The “J-Head” name and “V6” spec describe different hotend families, and the listing does not say which construction it uses.
- No manufacturer, warranty, thermistor type or installation guide is stated for the item.
- PTFE tube length differs by printer model, so a universal package needs the correct tube swapped in.
- No independent test or owner discussion of this exact item was found.
Verified specifications
| Nozzle | V6 0.4 mm (stated spec of the listing); Prusa’s official part uses a V6 0.4 mm nozzle. |
|---|---|
| Heater | 24 V 40 W heater cartridge. |
| Filament diameter | 1.75 mm. |
| Compatibility | MK3, MK3S, MK3S+, MK3.5 and MK3.5S. |
| Included (stated) | hotend thermistor and PTFE tube. Prusa’s official part also includes heaterblock, heatbreak, heatsink, collet and PTFE tube. |
| E3D V6 reference | all-metal heatbreak, cartridge-style heater block, groove mount, maximum temperature 300°C with supplied thermistor. |
| J-Head reference | PEEK nozzle holder, maximum working temperature roughly 248°C; not suitable above 248°C. |
| Official reference part price | Prusa lists its assembled hotend (for MK3 series) at $79.99. |
Full research notes and sources
Which hotend family this is
The listing calls itself “J-Head” but specifies a “V6 0.4 mm nozzle”. J-Head is a RepRap design with a PEEK nozzle holder limited to roughly 248°C and, in original form, a 5.6 ohm 5 W resistor heater. V6 is an E3D all-metal hotend rated to 300°C with a cartridge heater. These are different families with different heaters, temperature limits and construction, so the listing does not establish which one it builds. Treat it as an unverified compatible assembly until manufacturer documentation is provided.
No independent test or owner discussion of this exact item was found. J-Head documentation notes the design is more reliable printing PLA when a cooling fan is used, and the PEEK holder can melt if temperature limits are exceeded.
Compatibility and tube length
The stated compatibility matches Prusa’s official assembled hotend. PTFE tube length differs by model: MK3 vs MK3S vs MK3S+ and MK3.5. Prusa’s universal package since 6/2025 ships a hotend with a pre-installed tube for MK3S+ and MK3.5 plus separate tubes for MK3S and MK3. Buyers should confirm the tube length matches their printer.
Spares and running costs
Prusa’s official assembled hotend is priced at $79.99, and the official part is serviceable as individual parts: nozzle, heaterblock, heatbreak, heatsink, collet, PTFE tube, heater cartridge and thermistor are sold separately. E3D V6 1.75 mm all-metal hotend starts from £49.65 GBP (24 V bowden, without extras). Replacement nozzles, PTFE tubes, heater cartridges and thermistors are available individually from Prusa; there is no capsule or filament lock-in.
Is it worth it?
At or below the official $79.99 price, genuine Prusa and E3D parts offer documented compatibility and individual spare parts. A third-party “J-Head” assembly at a lower price should be treated as unverified: the naming conflicts with the V6 spec, and clone quality reports include clogging and fitment problems. Value depends on verified manufacturer documentation and return policy rather than listed specs alone.
Which model this is
This page covers a third-party listing sold as “Prusa I3 MK3S+ Hotend Extruder Assembly J-Head”, with stated specs of V6 0.4 mm nozzle, 24 V 40 W heater cartridge, 1.75 mm filament and compatibility with MK3, MK3S, MK3S+, MK3.5 and MK3.5S, including a hotend thermistor and PTFE tube. Those specs mirror Prusa’s official “Assembled hotend (for MK3 series)”. No ASIN was provided in the research inputs. Don’t confuse it with Prusa’s official E3D V6-based assembled hotend or with E3D V6 clones.
Sources
Manufacturer:
- Original Prusa assembled hotend (MK3 series)
- MK3 series hotend guide (Prusa Knowledge Base)
- Original Prusa spare parts
- Original Prusa MK3/MK3S/MK3S+ spare parts
Independent reviews:
Owner reports:
- No owner-report URLs were provided in the sources.
