Voron High Temperature Printing — PC, Nylon, PEEK, and PEKK Guide

Materials Printing High-Temp

Printing engineering-grade thermoplastics on a Voron opens up a world of functional parts that can withstand high temperatures, chemicals, and mechanical loads. Polycarbonate (PC), Nylon (PA6, PA12, PA-CF), PEEK, PEKK, and Ultem/PEI offer dramatically better properties than ABS — but they demand higher temperatures, precise moisture control, and modified hardware. This guide covers everything you need to print these materials successfully on your Voron V2.4, Trident, or custom build. Last updated: May 2025.

High-temperature printing is not for beginners. These materials require bed temperatures of 110-160°C, hotend temperatures of 300-500°C, and enclosure temperatures of 60-100°C. Stock Voron components — PTFE-lined hotends, standard panels, and uninsulated enclosures — hit their limits quickly. We cover the hardware upgrades, material handling procedures, and safety considerations needed for each material class.

Material Overview — What Each Material Is Best For

Each material prints differently. PC is relatively forgiving and is the best entry point into high-temp printing. Nylon is hygroscopic and requires aggressive drying. PEEK/PEKK need active chamber heating — a passive Voron enclosure at 60°C is not enough. We break down the requirements for each.

Temperature Requirements by Material

The key takeaway: a Voron's stock enclosure, relying on passive bed heat, reaches 50-60°C at best. This is sufficient for PC, nylon, and PA-CF. But PEEK, PEKK, and Ultem require active chamber heating to maintain 80-120°C. Without it, these materials will warp, delaminate, or simply fail to bond.

Voron Hardware Limits — What Stock Components Can and Can't Handle

Stock Hotend: 300°C Maximum (PTFE Lined)

The stock Voron hotend (a Dragon or Dragon-like clone with a PTFE-lined heatbreak) is rated to a maximum of 300°C. At 260°C and above, PTFE begins to degrade and off-gas toxic fumes (perfluoroisobutylene, among others). At 300°C, PTFE breaks down rapidly. You must switch to an all-metal hotend for any material requiring hotend temperatures above 260°C. For PC (260-300°C), an all-metal hotend is strongly recommended even at the low end of the range.

All-Metal Hotend Recommendations

• Goliath (500°C rated): The gold standard for high-temperature Voron printing. Full copper heat block with 500°C-rated thermistor and heater cartridge. Massive melt zone for high flow rates. Requires a modified Stealthburner mount. Supports nozzle sizes up to 1.0mm. Ideal for PEEK and PEKK. Price: $80-120.
• Rapido UHF (360°C rated): Excellent high-flow hotend with a specialized heatbreak design. Reaches 360°C safely, sufficient for PC, nylon, and Ultem. The UHF (Ultra High Flow) variant delivers 35-45 mm³/s, plenty for high-temp materials that require slower print speeds at higher temperatures. Good drop-in replacement for stock Voron hotends. Price: $50-70.
• Mosquito Magnum+ (450°C rated): Slice Engineering's high-flow all-metal hotend. Interchangeable nozzles, 450°C rated thermistor available. The Magnum+ heat block is larger than standard, providing more thermal mass for temperature stability. Requires a Mosquito-compatible Stealthburner Clockwork 2 mount. Price: $90-130.
• Sherpa Mini with CHC Volcano: A budget option for PC and nylon. The CHC (Ceramic Heater Cartridge) Volcano clone with an all-metal heatbreak costs $15-25 and works well up to 300°C. Match with a Bondtech CHT nozzle for improved flow with filled materials (PA-CF). Not suitable for PEEK/PEKK due to temperature limits.

Bed Recommendations

Stock Voron beds use a 120V or 240V AC silicon heater pad bonded to an aluminum tooling plate. This is sufficient for bed temperatures up to 120-130°C. For PEEK and PEKK printing at 140-170°C, you need upgrades:

• AC heated bed with SSR (Solid State Relay): The stock Voron AC bed setup with an SSR (Fotek or Auber SSR-40DA) and a thermal fuse is good to 130°C. For higher temperatures, upgrade to high-temperature SSR rated for 150°C+ continuous operation. Add a second thermal fuse as a redundant safety cutoff.
• Insulated bed underside: Mandatory for high-temperature printing. Add 5-10mm of silicone fiberglass insulation or high-temp foam to the underside of the bed. This reduces heat soak into the electronics bay, improves chamber temperature stability, and reduces power consumption. Without insulation, the bed surface temperature can fluctuate by 5-10°C at high setpoints.
• Bed sensor upgrade: The stock NTC 100K thermistor may read inaccurately above 130°C. Use a PT1000 RTD or PT100 sensor with an amplifier board (MAX31865 or AD8495) for accurate readings at 160°C+. Calibrate the sensor at 100°C and 150°C using a reference thermometer.

Enclosure Upgrades for High-Temp Printing

Panel Insulation

Stock Voron panels are 3-4mm polycarbonate or acrylic. For high-temperature printing, upgrade to 6mm twin-wall polycarbonate (SUNNYWELL or Makrolon) which provides significantly better insulation. Seal all panel seams with high-temperature foam gasket tape (silicone or FKM rubber). The aluminum extrusions conduct heat — add foam strip insulation inside the extrusion slots to reduce heat loss. A well-insulated Voron with a 110°C bed should sustain 60-65°C chamber temperature passively.

Active Chamber Heating

For PEEK, PEKK, and Ultem, passive chamber heating from the bed is insufficient. Your options for active chamber heating:

• Nevermore filter with heater: The Nevermore recirculation fan can be paired with a 12V or 24V silicone heater pad mounted inside the filter housing. The recirculating air passes over the heater, raising the chamber temperature 15-30°C above what the bed alone provides. Control via a separate thermistor and relay.
• Silicone heater pad on the bed underside: A secondary 200-400W silicone heater pad mounted to the bed's underside (below the primary heater) and controlled independently via an SSR. This provides supplemental heat for the chamber. Risk: overheating the electronics bay — ensure adequate insulation between the bed and electronics.
• Dedicated chamber heater: A 500-1000W PTC (Positive Temperature Coefficient) heater mounted in the electronics bay with a dedicated thermostat and over-temperature cutoff. This is the most capable solution for reaching 80-100°C chamber temperatures. Requires a separate 120V/240V circuit and a temperature controller (Inkbird or Auber).

Important: Active chamber heating requires thermal management of electronics. TMC2209 stepper drivers are rated to 85°C, but sustained 70°C+ reduces their lifespan. Relocate the mainboard and PSU outside the enclosure for high-temperature printing, or add active cooling (fans blowing over heatsinks inside the electronics bay). Many high-temp Voron builders use a separate electronics enclosure mounted below the printer with foam insulation and active exhaust.

Filament Drying — The Single Most Important Step

Engineering thermoplastics are hygroscopic — they absorb moisture from the air. Water in the filament turns to steam in the hotend, causing bubbling, popping, surface defects, and degraded mechanical properties. Nylon is the worst offender, absorbing 2-4% of its weight in water within hours of exposure. Proper drying is not optional.

Use a filament dryer capable of reaching 150°C (a modified food dehydrator, PrintDry Pro, or Eibos Polyphemus). For PEEK and PEKK, a vacuum oven is ideal — the reduced pressure lowers the boiling point of water and drives moisture out more effectively. A dry box is mandatory during printing: feed the filament from a sealed container with desiccant (silica gel or molecular sieve) and a PTFE tube guide. For nylon, print within 4-8 hours of drying or the material will absorb enough moisture to cause visible defects.

Bed Adhesion for Engineering Materials

Each material bonds differently to build surfaces. Using the wrong surface means failed prints and damaged sheets.

• PC (Polycarbonate): Best on smooth PEI at 110-120°C. Apply a thin layer of Magigoo PC or Vision Miner Nano Polymer Adhesive. Do NOT use textured PEI — PC bonds too aggressively and can tear chunks out of the sheet on removal. G10/FR4 also works well with a light sanding. Let the bed cool to 40°C before removing parts — PC has a high coefficient of thermal expansion and can warp if pried off hot.
• Nylon PA6/PA12: Best on G10/FR4 (garolite) at 80-110°C. The slightly porous surface provides mechanical grip as the nylon shrinks during cooling. Apply Magigoo PA or a thin layer of PVA glue stick. Textured PEI with Magigoo also works but requires frequent cleaning. Do NOT use smooth PEI — nylon will stick too well and can delaminate the PEI coating. A 8-10mm brim is recommended for all nylon prints.
• PA-CF: Same as nylon: G10/FR4 at 90-110°C. The carbon fiber reduces overall shrinkage compared to unfilled nylon, so warping is less severe. However, the rough surface of G10 helps anchor the part. A 5mm brim is usually sufficient.
• PEEK: The most demanding adhesion requirement. Use PEEK film (300mm x 300mm sheets, 0.1mm thick) placed on a smooth glass or aluminum bed at 150-160°C. The PEEK film chemically bonds with the printed part. Alternatively, use a PEI sheet at 160°C with Vision Miner Nano Polymer Adhesive specifically formulated for PEEK. Remove the bed sheet with the part still attached, let it cool to room temperature, then flex the sheet to release. Never try to remove PEEK from a hot bed.
• PEKK: Same as PEEK — PEEK film at 140-170°C. PEKK has slightly lower adhesion force than PEEK but still requires a film surface for reliable bonding. Nano Polymer Adhesive also works.
• Ultem 1010: PEI sheet (smooth) at 140-150°C with Magigoo PC or Nano Polymer Adhesive. G10/FR4 at 140°C also works. Ultem bonds well but not aggressively — parts release easily once cooled below 60°C.

Recommended Print Profiles

Nozzle material is critical. PC, nylon (especially PA-CF), PEEK, and PEKK are abrasive. A brass nozzle will wear out within 100-200g of PA-CF. Use hardened steel nozzles at minimum. For PEEK at 400°C+, use a nickel-plated copper nozzle with a hardened steel tip (Olsson Ruby or Bondtech CHT hardened). The nickel-plated copper provides better thermal conductivity than full hardened steel, critical for high-temperature extrusion accuracy.

Safety Considerations

High-temperature printing introduces real safety hazards that do not exist with ABS or PLA. Do not attempt PEEK or PEKK printing without addressing each of these:

• Enclosure temperature monitoring: Install at least one redundant chamber thermistor with an over-temperature alarm in Klipper. A runaway chamber heater can damage electronics, melt printed parts, or create a fire hazard. Configure Klipper's temperature_sensor section with a max_temp limit and a shutdown macro:

• Fire prevention: High-temperature hotends (350-500°C) can ignite combustible materials. Ensure no zip ties, filament strands, or printed parts are within 20mm of the heat block. Use a silicone sock on the hotend at all times. Install a thermal fuse on the bed heater (rated at 150°C or 180°C depending on your bed temperature) wired in series with the SSR. Never leave a high-temperature print unattended for extended periods.
• Fumes and ventilation: PC, nylon, PEEK, and Ultem all off-gas during printing. PC releases bisphenol-A (BPA) byproducts at high temperatures. Nylon produces caprolactam fumes. PEEK and Ultem produce trace volatile organic compounds. While less acutely toxic than ABS fumes, these should not be inhaled. Use a Nevermore carbon filter inside the enclosure and vent the printer area with an exhaust fan to outdoors. A HEPA filter plus activated carbon filter (e.g., a Bento Box with dual-stage filtration) is strongly recommended for high-temperature printing.
• Thermal burns: The bed at 160°C and the enclosure interior at 100°C can cause serious burns. Install heat-resistant gloves near the printer. Label the printer clearly — anyone walking up to it may not expect 100°C+ surfaces. Let the printer cool below 50°C before opening the enclosure doors.

Material Selection Guide — Which Material for Which Part

• Voron printed parts (gantry mounts, AB drive units, extruder body): PC is the best choice if you want better heat resistance than ABS without the complexity of PEEK. PC has 65-75 MPa tensile strength vs 40-50 MPa for ABS, and its glass transition temperature of 145°C means Voron parts printed in PC will never sag or deform in a hot enclosure. Nylon is not recommended for Voron printed parts — it's too flexible and has higher creep under constant load.
• Functional gears and bushings: Nylon PA12 or PA-CF. The self-lubricating property of nylon makes it ideal for gears, Voron Z axis lead screw nuts, and belt idler pulleys. PA-CF adds stiffness that approaches aluminum, making it suitable for motor mounts and gantry brackets.
• High-temperature tooling: PEEK or PEKK. If you need parts that survive at 200°C+ continuous operation (enclosure ducting near the heater, toolhead components on a high-temp printer), PEEK is the answer. PEKK offers slightly higher strength and better chemical resistance than PEEK at a similar price point ($200-400/kg).
• Electrical insulators: Ultem 1010. It naturally meets UL94 V-0 flammability rating. Use it for electrical standoffs, mainboard mounts, and any part near high-voltage components. Ultem is also ESD-safe grades available if you need static dissipation in electronics areas.