The Prusa Pro HT90 is a professional delta FDM 3D printer built around one capability that most desktop machines cannot offer: a fully enclosed chamber that heats to 90°C. That single feature unlocks a class of engineering materials — PEEK, PEKK, PPS, PSU, PEI (Ultem) — that previously required industrial machines costing five to ten times more. The HT90 brings them into reach for engineering teams, R&D labs, medical device companies, and serious professionals.

Key Specifications

Build volume	Ø300 × 400 mm (cylindrical)
Kinematics	Delta
Chamber temperature	Up to 90°C
Nozzle temperature	Up to 500°C
Print heads included	2 — High-Flow and High-Temperature (swappable)
Filtration	HEPA air recirculation built in
Connectivity	Online and offline operation
Resonance compensation	Input Shaper technology
Extruder type	Direct drive with load cell sensor

90°C Chamber — Why It Matters

Warping, layer delamination, and internal stress in engineering materials are almost always caused by thermal gradients — the part cools unevenly as it's being printed. A heated chamber eliminates this by maintaining uniform ambient temperature around the part throughout the print. At 90°C, the HT90 creates the right thermal environment for high-performance polymers that require it, while also significantly improving results with mid-range materials like ABS, ASA, PA, and PCCF that benefit from reduced thermal stress even if they don't strictly require a heated chamber.

Material Compatibility

Material class	Examples	Chamber required
Standard	PLA, PETG, PLA HS	No — chamber can be open or closed
Engineering	ABS, ASA, PA, PA-CF, PCCF	Recommended — reduces warping and delamination
High-performance	PEEK, PEKK, PPS, PSU, PES, PEI (Ultem)	Required — chamber at 90°C

The 500°C capable nozzle handles the most demanding engineering polymers with no hardware modifications required. Both print heads are included in the box — no additional purchases needed to access high-temperature capability.

Dual Swappable Print Heads

The HT90 ships with two specialised heads that swap without tools:

• High-Flow Head — optimised for standard and mid-range materials at high speeds. Input Shaper resonance compensation enables rapid prototyping without sacrificing surface quality.
• High-Temperature Head — engineered for materials requiring nozzle temperatures up to 500°C. Compatible with all high-performance engineering polymers.

Switching heads takes minutes and requires no recalibration — the load cell sensor handles automatic first layer calibration on every print.

HEPA Filtration

Printing PEEK, Ultem, and similar high-performance polymers generates VOCs and ultrafine particles. The HT90's built-in air recirculation system with HEPA filtration continuously purifies the chamber air during printing, reducing exposure to harmful emissions. This is not an optional add-on — it is integrated into the machine and active whenever the chamber is in use.

Delta Kinematics

The delta configuration — three arms moving a central print head — enables faster movement speeds and a large cylindrical build volume that suits tall, round, and rotationally symmetric parts particularly well. The Ø300mm diameter and 400mm height accommodate industrial-scale prototypes in a single print. Delta printers also have fewer moving parts in the XY plane than Cartesian machines, which contributes to the mechanical precision the HT90 maintains across its full build volume.

Who the HT90 Is For

• Engineering and R&D teams printing functional prototypes in PEEK, PA-CF, or PPS that need to survive real operating conditions
• Medical device companies requiring biocompatible, autoclave-sterilisable materials such as PEEK and PEI
• Automotive and aerospace prototyping where parts must meet thermal and mechanical requirements, not just look right
• Industrial tooling — jigs, fixtures, and end-of-arm tooling in high-temperature resistant polymers
• University and research labs needing professional-grade material capability without industrial machine budgets

Available from Eolas Prints

Eolas Prints is an authorised Prusa reseller based in Cantabria, Spain, serving customers across Europe. We stock the Prusa Pro HT90 with full manufacturer warranty and EU-compliant support.