MillRight CNC Mega V 2 XXL (50x50) vs Sienci Labs AltMill MK2 4x4
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: MillRight CNCMillRight CNC Mega V 2 XXL (50x50)
$4,449.00
Where they differ
- Sienci Labs AltMill MK2 4x4 is listed $1,289 lower ($3,160.00* against $4,449.00).
- MillRight CNC Mega V 2 XXL (50x50) has the larger published X × Y work area: 1270 × 1270 mm against 1245 × 1245 mm (1.0× the area).
- Sienci Labs AltMill MK2 4x4 lists more Z: 140 mm against 133 mm.
- Drive: MillRight CNC Mega V 2 XXL (50x50) has mixed drive; Sienci Labs AltMill MK2 4x4 has ballscrew drive.
- Published footprints: 1,473 × 1,600 mm against 1,499 × 1,575 mm.
- Ready to cut (machine plus the cheapest sourced router or spindle, before bits): $4,639 against $4,085.
Published specs
| MillRight CNC Mega V 2 XXL (50x50) | Sienci Labs AltMill MK2 4x4 | |
|---|---|---|
| Price | $4,449.00 | $3,160.00* |
| Work area | 1270 × 1270 mm | 1245 × 1245 mm |
| Z | 133 mm (5.2") | 140 mm (5.5") |
| Spindle or router | Not included; Makita or DeWalt router mounts and 1.5 kW / 2.2 kW spindles are paid options | Not included; standard 80 mm spindle mount only. Optional 1.5 kW and 2.2 kW ER20 spindle kits and a 2.2 kW ATC kit. |
| Drive | Steel rack and pinion on X and Y; screw drive on Z | Ballscrews on all axes |
| Linear guides | Linear profile rails on every axis | HGR15 linear guides on all axes |
| Controller and motors | GRBL by default (Masso G3 Touch +$2,200). Closed-loop motors. | SLB-EXT controller with e-stop. Closed-loop steppers; "over 600IPM". |
| Software | CAD/CAM not included; MillRight's UGS for GRBL | Not published |
| Footprint | 58" x 63" | 59″ wide × 62″ deep |
| Weight | Not published | 76 lb |
| Warranty | Not published | 120 days from receipt |
| Spec notes | 1 | 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.