How does the Prusa Research Original Prusa MK3.5 compare to the Prusa MK4S?

The Prusa Research Original Prusa MK3.5 ($649, Cartesian / Bed-Slinger, 250×210×210 mm) features a 290°C hotend with a 18.0 mm³/s flow ceiling and Open Frame. The Prusa MK4S ($799, Cartesian / Bed-Slinger, 250×210×220 mm) offers a 290°C hotend with a 24.0 mm³/s flow ceiling and Open Frame. For full side-by-side engineering specifications and polymer readiness, visit https://slicespec.com/compare/prusa_mk3_5-vs-prusa_mk4s.

Which printer has a higher volumetric flow ceiling, Prusa Research Original Prusa MK3.5 or Prusa MK4S?

Prusa MK4S has the higher flow ceiling at 24.0 mm³/s compared to 18.0 mm³/s on the Prusa Research Original Prusa MK3.5, enabling faster infill speeds without extruder clicking.

3D Printing Filament & OrcaSlicer Profile Calculator OrcaSlicer v2.2+ · Klipper & Marlin

Prusa Research Original Prusa MK3.5 vs Prusa MK4S Specs & Comparison

Validated OrcaSlicer profile for printing Elegoo Rapid / High-Flow PETG on the Anycubic Kobra X (300°C all-metal DD, 0.4 mm Brass) — tuned for 245°C / 75°C temps, 21.0 mm³/s max volumetric flow, 250 mm/s speed cap, PA 0.032, and DFAM CAD clearances.

Why Black-Filament Baseline? (+5°C Carbon-Black Viscosity Margin): Black spools contain 1.5–3% Carbon Black pigment, which raises melt viscosity and alters heat transfer—requiring +3°C to +5°C higher nozzle temperature and a conservative volumetric flow ceiling vs. natural/light filaments for full inter-layer fusion. Calibrating every profile to a Black baseline guarantees that Black, White (TiO₂), and all standard colors print with zero under-extrusion, extruder clicking, or delamination.

print Printer Setup

300°C All-Metal DD

Nozzle Ø

Nozzle Mat

Filament & Temperature

Auto Temp (Black +5°C)

Nozzle Temp Rec: 230–260°C

°C

Bed Temp Rec: 65–85°C

°C

check_circle Manufacturer range (Elegoo Rapid PETG): 230°C – 260°C nozzle · 65°C – 85°C bed

Nozzle & Bed Temp thermostat

245° / 75°C

Rec: 230–260°C · Brass nozzle

Max Volumetric Flow air

21.0 mm³/s

300°C all-metal DD · 0.4mm Brass

Safe Linear Speed Cap speed

250 mm/s

Outer: 130 mm/s · Infill: 250 mm/s

Retraction & Fan Cooling mode_fan

0.8 mm / 35%

PA K-Factor: 0.032 · Dry at 65°C

Layer Height (h) 0.20 mm

Fine (0.08) Optimal (0.20) Draft (0.32)

CAD Assembly Fit (DFAM) +0.23 mm

Compensates XY shrinkage & seam

Wall Multiples

2L: 0.84 · 3L: 1.26mm

Bottom Chamfer

0.20 mm @ 45°

Sacrificial Bridge

0.20 mm (1 layer)

Heat-Set Iron

260°C (+15°C)

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Direct fitment for current profile

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Elegoo Rapid PETG Black

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For Anycubic Kobra X arrow_outward

0.4mm Brass Nozzle

Matched hotend thread →

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65°C Active Dryer Box

Dry Rapid PETG at 65°C →

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3D Printer Hardware Comparison & Engineering Specs OrcaSlicer System Profiles · 247 FDM Models

Prusa Research Original Prusa MK3.5 vs Prusa MK4S Specs & Comparison

Comprehensive head-to-head engineering comparison between Prusa Research Original Prusa MK3.5, Prusa MK4S. Evaluating approximate street prices ($649 vs $799), build volume (250×210×210 mm vs 250×210×220 mm), kinematics (Cartesian / Bed-Slinger vs Cartesian / Bed-Slinger), hotend max temperatures (290°C vs 290°C), volumetric flow ceilings (18.0 mm³/s vs 24.0 mm³/s), linear print speeds (200 mm/s vs 300 mm/s), chamber types (Open Frame vs Open Frame), and polymer compatibility.

Engineering Comparison Methodology

Specifications are cross-verified against official OrcaSlicer system profiles (resources/profiles/), manufacturer Technical Data Sheets, and volumetric flow bench testing. Max volumetric flow ceilings are normalized for standard 0.4 mm brass/hardened steel hotends. Winner badges highlight measurable engineering advantages with strict tie-break elimination.