Inventables X-Carve Pro 4x2 vs Sienci Labs AltMill MK2 2x4
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 4x2
$4,995.00
Where they differ
- Sienci Labs AltMill MK2 2x4 is listed $1,105 lower ($3,890.00* against $4,995.00).
- Sienci Labs AltMill MK2 2x4 has the larger published X × Y work area: 1245 × 635 mm against 1219 × 610 mm (1.1× the area).
- Sienci Labs AltMill MK2 2x4 lists more Z: 140 mm against 102 mm.
- Inventables X-Carve Pro 4x2 doesn't say whether one is included; Sienci Labs AltMill MK2 2x4 doesn't include one.
- Inventables X-Carve Pro 4x2 lists motors the page doesn't describe as open or closed loop; Sienci Labs AltMill MK2 2x4 lists closed-loop motors.
- Published footprints: 1,670 × 803 mm against 1,499 × 965 mm.
Published specs
| Inventables X-Carve Pro 4x2 | Sienci Labs AltMill MK2 2x4 | |
|---|---|---|
| Price | $4,995.00 | $3,890.00* |
| Work area | 1219 × 610 mm | 1245 × 635 mm |
| Z | 102 mm (4.0") | 140 mm (5.5") |
| Spindle or router | 1.5 kW spindle, 8,000-24,000 RPM, ER16 (not listed as an included item) | Not included; standard 80 mm spindle mount. Optional 1.5 kW and 2.2 kW ER20 spindle kits and a 2.2 kW ATC kit. |
| Drive | 1" ball screws | Ballscrews on all axes |
| Linear guides | Linear guides | HGR15 linear guides on all axes |
| Controller and motors | Not published | SLB-EXT controller with e-stop. Closed-loop steppers on all three axes; about 600 in/min. |
| Software | Easel Pro trial | Not published |
| Footprint | 65.75" x 31.6" | 59″ wide × 38″ deep |
| Weight | 275 lb | 76 lb |
| Warranty | 1 year | 365 days from receipt |
| Spec notes | None found | None found |
| 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.