1.75mm vs 2.85mm Filament: Which Diameter
Why 1.75 mm took over
- Faster melting in the hotend = higher print speeds
- Easier extruder design (smaller forces)
- Better detail and finer extrusion control
- Most consumer printers standardised on it
- Direct drive extruders are simpler at 1.75 mm
Where 2.85 mm is still used
- Original Ultimaker printers (legacy)
- LulzBot printers
- Some industrial / large-format machines
- Some educational printer ranges
Can you swap diameters?
No, not without significant hardware changes. The hotend, PTFE tube, extruder drive gear and nozzle are all sized for one diameter. Swapping diameters means replacing all of these. Easier to buy filament for your printer's native size.
Diameter tolerance matters more than size
Within either standard, diameter consistency matters more than the size itself. Prusament's ±0.02 mm tolerance gives more consistent results than another brand's ±0.05 mm, regardless of whether you are running 1.75 or 2.85 mm.
Siddament stocks
Standard 1.75 mm filament across the entire 1200+ SKU range. 2.85 mm available on selected lines; check product pages.