- Which is better for printing ABS and ASA?
- The P1S. Its enclosed frame keeps heat in and blocks drafts, which ABS and ASA need. The Neptune 4 Plus is open, so large ABS parts are more likely to warp unless you build an enclosure.
- Which has the bigger build volume?
- The Neptune 4 Plus. It prints 320 × 320 × 385 mm against 256 × 256 × 256 mm on the P1S, so it fits larger single pieces like full helmets.
- Is the P1S worth $70 more?
- Yes if you print ABS or ASA, want multi-color, or want the camera and enclosed frame. If you mostly print PLA and PETG and need size, the Neptune 4 Plus at $279.00 does more for less.
- Which prints faster?
- The Neptune 4 Plus lists up to 500 mm/s with 12,000 mm/s² acceleration, though default is 250 mm/s. The P1S listing does not state a speed figure, so compare real print times rather than peak numbers.
- Do both have automatic bed leveling?
- Yes. The P1S levels automatically, and the Neptune 4 Plus uses a 121-point (11 × 11) mesh. Some Neptune 4 Plus buyers report one side of the bed failing to level.
- Which is more reliable?
- The P1S has the stronger track record for out-of-box consistency. Neptune 4 Plus owners report good results but also belt, firmware and bed-leveling failures within months, plus email-only support.
