# Inventables X-Carve Pro (4x4) vs Sienci LongMill MK2 (48x30): specs and price compared

A sourced, side-by-side comparison of the Inventables X-Carve Pro (4x4) (Inventables) and Sienci LongMill MK2 (48x30) (Sienci Labs) among desktop cnc machines. Sienci LongMill MK2 (48x30) is the cheaper of the two at $1799.

## Side by side

| Spec | Inventables X-Carve Pro (4x4) | Sienci LongMill MK2 (48x30) |
| --- | --- | --- |
| US price | $11995 | $1799 |
| Brand | Inventables | Sienci Labs |
| Released | 2021-01-01 | 2022-02-01 |
| Work area x (mm) | 1219 | 1219 |
| Work area y (mm) | 1219 | 762 |
| Work area z (mm) | 102 | — |
| Spindle power (W) | 1500 | 710 |
| Spindle speed (rpm) | 8,000-24,000 | 10,000-30,000 |
| Frame material | Powder-coated aluminum gantry with 25mm ball screws and linear guides | Extruded aluminum rails with UHMW/HDPE wheels, lead screw drive on all axes |
| Controller firmware | X-Controller Pro (Inventables proprietary controller enclosure), Easel Pro software | Sienci controller box (GRBL-based), gSender sender software |
| Max feed rate mm min | — | — |
| Repeatability (mm) | 0.025 | — |

## Key differences

- Work area y (mm): Inventables X-Carve Pro (4x4) 1219 vs Sienci LongMill MK2 (48x30) 762
- Spindle power (W): Inventables X-Carve Pro (4x4) 1500 vs Sienci LongMill MK2 (48x30) 710
- Spindle speed (rpm): Inventables X-Carve Pro (4x4) 8,000-24,000 vs Sienci LongMill MK2 (48x30) 10,000-30,000
- Frame material: Inventables X-Carve Pro (4x4) Powder-coated aluminum gantry with 25mm ball screws and linear guides vs Sienci LongMill MK2 (48x30) Extruded aluminum rails with UHMW/HDPE wheels, lead screw drive on all axes
- Controller firmware: Inventables X-Carve Pro (4x4) X-Controller Pro (Inventables proprietary controller enclosure), Easel Pro software vs Sienci LongMill MK2 (48x30) Sienci controller box (GRBL-based), gSender sender software

## Sources

- Inventables X-Carve Pro (4x4): https://www.inventables.com/pages/x-carve-pro-tech-specs (inventables.com, verified 2026-08-09)
- Sienci LongMill MK2 (48x30): https://sienci.com/2022/02/24/everything-you-need-to-know-about-the-longmill-mk2-48x30-and-extension-kits/ (sienci.com, verified 2026-08-09)

Canonical: https://frontdeskreview.com/gear/desktop-cnc-machines/inventables-x-carve-pro-4x4-vs-sienci-longmill-mk2-48x30/
Cite: Per The Front Desk Review, Inventables X-Carve Pro (4x4) ($11995) vs Sienci LongMill MK2 (48x30) ($1799) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/desktop-cnc-machines/inventables-x-carve-pro-4x4-vs-sienci-longmill-mk2-48x30/
License: CC BY 4.0.