Inventables X-Carve Pro 4x4 vs Sienci Labs AltMill 4x8
Two desktop CNC routers side by side, from each maker's own page, read 1 November 2026. Neither has been tested for this site, so this shows what each maker publishes, not which cuts better.
Photo: InventablesInventables X-Carve Pro 4x4
$7,495.00
Where they differ
- Inventables X-Carve Pro 4x4 is listed $2,895 lower ($7,495.00 against $10,390.00*).
- Sienci Labs AltMill 4x8 has the larger published X × Y work area: 1265 × 2640 mm against 1219 × 1219 mm (2.2× the area).
- Sienci Labs AltMill 4x8 lists more Z: 210 mm against 102 mm.
- Inventables X-Carve Pro 4x4 doesn't say whether one is included; Sienci Labs AltMill 4x8 doesn't include one.
- Drive: Inventables X-Carve Pro 4x4 has ballscrew drive; Sienci Labs AltMill 4x8 has mixed drive.
- Inventables X-Carve Pro 4x4 lists motors the page doesn't describe as open or closed loop; Sienci Labs AltMill 4x8 lists closed-loop motors.
- Published footprints: 1,670 × 1,416 mm against 1,676 × 2,896 mm.
Published specs
| Inventables X-Carve Pro 4x4 | Sienci Labs AltMill 4x8 | |
|---|---|---|
| Price | $7,495.00 | $10,390.00* |
| Work area | 1219 × 1219 mm | 1265 × 2640 mm |
| Z | 102 mm (4.0") | 210 mm (8.3") |
| Spindle or router | 1.5 kW spindle, 8,000-24,000 RPM, ER16 (not listed as an included item) | Not included |
| Drive | 1" ball screws | Rack and pinion on Y; ballscrews on X and Z |
| Linear guides | Linear guides | 15 mm linear rails |
| Controller and motors | Not published | SLB-Ext, grblHAL. Closed-loop NEMA 23 steppers. |
| Software | Easel Pro trial | gSender |
| Footprint | 65.75" x 55.75" | About 66" x 114" |
| Weight | 300 lb | 400 lb assembled (see spec notes) |
| Warranty | 1 year | 365 days |
| Spec notes | 1 | 3 |
| Source | Maker’s page ↗ | Maker’s page ↗ |
Work areas to scale
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Why this pair
Pairs are picked by a rule: machines in the same size class and within about 60% of each other's price, plus each machine's nearest sibling from the same maker. No search or keyword data was used. All 46 pairs.