Prusa’s 400 °C HT Hotend Is Out for Single-Extruder CORE One Printers at $199.99
Prusa’s $199.99 HT Hotend upgrade for single-extruder CORE One printers shows a three-week lead time, and its first install replaces several Nextruder parts.
Prusa announced on October 21 that its HT Hotend, rated for nozzle temperatures up to 400 °C, is out for single-extruder CORE One printers; its store was already taking orders. With the United States selected, the upgrade lists at $199.99 with import duties included and an estimated three-week lead time, and a CORE One L+ with it pre-installed lists at $2,169. Prusa calls it a quick-swap upgrade, but its installation guide shows the first fit replaces Nextruder parts and needs a gearbox calibration. Prusa rules out INDX, the XL+ and the MK4S.
A $199.99 upgrade, a factory-fitted L+ and a first install that changes Nextruder parts
With the United States selected, Prusa’s store lists the upgrade with import duties included and an estimated three-week lead time.
Prusa lists a CORE One L+ with the HT Hotend pre-installed at $2,169 with a two-week preparation time, $170 more than the standard L+ by the site’s arithmetic.
Prusa describes switching hotends as taking less than a minute, but its installation guide shows the first fit replaces Nextruder parts and requires a gearbox calibration.
ReportPrusa Research
A 400 °C upgrade, a factory-fitted L+ and a first install that replaces Nextruder parts
On October 21, Prusa announced that its HT Hotend, rated for nozzle temperatures up to 400 °C, is out, offered “either as an upgrade for the printer you have, or factory-mounted on a new Prusa CORE One L+”. With the United States selected on October 22, Prusa’s store listed the HT Hotend Upgrade at $199.99 with import duties included, orderable with an estimated three-week lead time, and the CORE One L+ (HighTemp Hotend) at $2,169 with a two-week preparation time, against $1,999 for the standard CORE One L+. Prusa also added HighTemp print sheets at $70.99 for the CORE One/+ and $72.99 for the CORE One L/+, and three high-temperature filaments: PPS-CF, PPS-GF and Siraya Tech Fibreheart PPA-CF Core. The store was ahead of the October 21 post: Internet Archive copies show the upgrade orderable on September 29 and the factory-fitted L+ page by October 5, about ten months after Prusa first showed the hotend at Formnext in November 2025.
The hotend is aimed at two jobs. Prusa says printing standard Prusaments above 300 °C improves interlayer adhesion, citing its own measurements of +23 % for PA11 Carbon Fiber, +18 % for ASA and +7 % for PC Blend and PC Blend Carbon Fiber, and it opens PPS and PPA composites. PEEK, PEKK and PEI remain small-part materials: Prusa says the CORE One’s 60 °C chamber is too low for larger parts, so only small parts may print. For these materials Prusa strongly recommends chamber filtration, advises against brass nozzles and warns never to print PLA at high temperature. The Crafty Catsman has not used the HT Hotend and owns no CORE One printer, so the adhesion figures are Prusa’s own measurements, not findings.
What the first install and high-temperature printing involve
Prusa rates the HT Hotend for nozzle temperatures up to 400 °C and ships it with a hardened, non-high-flow 0.4 mm ObXidian 500 nozzle. It fits the CORE One, CORE One+, CORE One+ (Gen 2), CORE One L and CORE One L+, with the L+ giving the best results by Prusa’s account. The upgrade box lists the hotend, two new idlers, a new main plate printed in PC Blend Carbon Fiber and gloves. Prusa’s installation guide says the first fit replaces several Nextruder parts with high-temperature resistant versions: the top cover comes off, the hotend, gearbox assembly and main plate come out, the HT main plate goes in, and you fit one of the two supplied idlers, the S idler for standard filaments or the H idler for demanding, brittle materials. Because the gearbox is taken apart, the guide says a gearbox calibration must be performed and recommends the full self-test. Its tools are a 2.5 mm Allen key, a T6 key, a T10 screwdriver and needle-nose pliers. Prusa describes the HT Hotend as a quick-swap upgrade that switches with another hotend in less than a minute; the first fit follows the installation guide above. Prusa states no minimum firmware on the product page or in the installation guide; the 7.0.0 notes for the CORE One/+ and CORE One L/+, dated October 5, list HT hotend support with automatic hotend detection.
Budget the sheet, the filtration and the setup time, not just the hotend: The upgrade is $199.99 on its own. High-temperature materials add costs Prusa itself points to: a HighTemp sheet at $70.99 for the CORE One/+ or $72.99 for the CORE One L/+, which Prusa says gives the best adhesion for PEI, PEEK, PEKK, PPSU and PPS but holds standard materials poorly, and a filtration system, for which Prusa offers its Advanced Filtration System Upgrade or suggests printing an adapter that connects the printer’s rear exhaust to an HVAC system. For a new printer, the factory-fitted CORE One L+ at $2,169 is $170 more than the standard L+ at $1,999 by the site’s arithmetic; its box list names the HT Hotend and two idlers but no standard hotend. INDX is the fork in the road: Prusa says the HT Hotend is not compatible with INDX, and adding INDX to a CORE One L+ means giving up the HT hotend.
- When orders placed now will arrive; Prusa gives only an estimated three-week lead time for the upgrade and a two-week preparation time for the factory-fitted L+.
- Whether Prusa will make a version for the XL+; it says only that this version does not fit because of short wire length.
- Whether the factory-fitted CORE One L+ includes a standard hotend; its box list names only the HT Hotend.
- How the hotend holds up for owners over time; the adhesion figures are Prusa’s own measurements.
Hold off if:You run INDX or plan to add it, own an XL+ or MK4S, or mainly need PEEK, PEKK or PEI parts larger than Prusa’s small-part guidance.
Consider it if:You own a single-extruder CORE One printer, want PPS or PPA composites or stronger PA11 Carbon Fiber and PC Blend layers, and can add filtration and do the guided conversion with its gearbox calibration.
HT Hotend — Prusa’s listed details
| Detail | Prusa Research HT Hotend Upgrade |
|---|---|
| Upgrade price (United States selected) | $199.99, import duties included |
| Availability shown | Orderable; estimated three-week lead time |
| Factory-fitted option | CORE One L+ (HighTemp Hotend), $2,169; two-week preparation |
| Standard CORE One L+ | $1,999 |
| HighTemp print sheets | $70.99 (CORE One/+), $72.99 (CORE One L/+) |
| Nozzle temperature | Up to 400 °C |
| Nozzle supplied | Hardened non-high-flow 0.4 mm ObXidian 500 |
| Fits | CORE One, CORE One+, CORE One+ (Gen 2), CORE One L, CORE One L+ |
| Not for | INDX, XL+ (this version), MK4S |
| First install | New main plate and idler, then a required gearbox calibration |
| Chamber limit | 60 °C; PEEK, PEKK and PEI small parts only |
| Minimum firmware | Not stated by Prusa |
Sources: Prusa Research official specs
Match the hotend to your printer and your materials before ordering.
Budget the $199.99 upgrade, add a HighTemp sheet ($70.99, or $72.99 for the CORE One L/+) if you plan PPS, PPSU, PEI, PEKK or PEEK, and allow time for the guided conversion and its gearbox calibration.
Prusa says the hotend is not compatible with INDX, does not fit the XL+ in this version and is not supported on the MK4S. Adding INDX to a CORE One L+ means giving up the HT hotend.
Prusa shows the HT Hotend at Formnext
Prusa’s Formnext post introduced the HT Hotend Upgrade for the CORE One family and pointed buyers to a notify-me list, with availability then expected around February 2026.
Prusa says the hotend will arrive in September
Prusa’s lineup post said the HT Hotend had taken longer than originally planned and would be available for the CORE One L/+ and the CORE One, One+ and One+ (Gen 2) in September.
Prusa’s store takes orders
An Internet Archive copy of Prusa’s product page from September 29 shows the upgrade orderable at $199.99 with a two-week preparation time; the factory-fitted CORE One L+ page appears in the archive from October 5.
Prusa announces the HT Hotend is out
Prusa’s announcement offers the hotend as an upgrade or pre-installed on a new CORE One L+, adds HighTemp print sheets and three high-temperature filaments, and says the hotend is not compatible with INDX.
Primary pages and records used for this report.
Frequently Asked Questions
Will the HT Hotend work on an MK4S, an XL+ or a CORE One with INDX?▼
No, according to Prusa. It says the MK4S is not supported, that this version of the hotend does not fit the XL+ because its wires are too short, and that it is not compatible with INDX because it is made for single-extruder CORE One printers and does not work with induction heating. Adding INDX to a CORE One L+ means giving up the HT hotend.
Can the HT Hotend print PEEK, PEKK or PEI?▼
Only small parts, according to Prusa. It says the 400 °C hotend and 120 °C bed are on the lower end but sufficient for those materials, but the CORE One’s 60 °C chamber is too low, so larger parts warp and fail often. Prusa also strongly recommends chamber filtration because most high-temperature materials emit dangerous fumes.
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