SainSmart PROVerXL 2x2 vs Sienci Labs AltMill MK2 2x4
Two desktop CNC routers side by side, using each maker's own specs, checked 4 November 2026 and 1 November 2026. We haven't tested either one, so this compares what the makers publish, not how well they cut.
Photo: SainSmartSainSmart PROVerXL 2x2
$2,999.00
Where they differ
- SainSmart PROVerXL 2x2 is listed $891 lower ($2,999.00 against $3,890.00*).
- Sienci Labs AltMill MK2 2x4 has the larger published X × Y work area: 1245 × 635 mm against 679 × 679 mm (1.7× the area).
- Sienci Labs AltMill MK2 2x4 lists more Z: 140 mm against 113 mm.
- SainSmart PROVerXL 2x2 doesn't say whether one is included; Sienci Labs AltMill MK2 2x4 doesn't include one.
- Published footprints: 1,161 × 1,142 mm against 1,499 × 965 mm.
Published specs
| SainSmart PROVerXL 2x2 | Sienci Labs AltMill MK2 2x4 | |
|---|---|---|
| Price | $2,999.00 | $3,890.00* |
| Work area | 679 × 679 mm | 1245 × 635 mm |
| Z | 113 mm (4.4") | 140 mm (5.5") |
| Spindle or router | 710W AC spindle, 30,000 RPM, in the spec table. The page doesn't say plainly whether it's in the box. | 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 | Ball screws: X 20 mm, Y 20 mm, Z 12 mm (spec table) | Ballscrews on all axes |
| Linear guides | HG20 linear guides on Y, HG15 on X and Z | HGR15 linear guides on all axes |
| Controller and motors | 32-bit board, GRBL 1.1h. Closed-loop NEMA 23 steppers. | SLB-EXT controller with e-stop. Closed-loop steppers on all three axes; about 600 in/min. |
| Software | GRBL senders such as Candle and UGS; VCarve Desktop or Pro in bundles | Not published |
| Footprint | 1161 x 1142 x 617 mm | 59″ wide × 38″ deep |
| Weight | 90 kg (198.4 lb) | 76 lb |
| Warranty | One year | 365 days from receipt |
| Spec conflicts | 1 | None found |
| Source | Maker’s page ↗ | Maker’s page ↗ |
Work areas to scale
Open in the compare tool See them on your bench
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 61 pairs.
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