Sienci Labs · read 1 November 2026
AltMill MK2 4x4
- ✗ Router not included
- Closed-loop
What's in the box, and what you'll still need
Included, per the page
- The machine: frame, motion system and electronics
You'll still need
- A router or spindle. 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.
- Design and toolpath (CAD/CAM) software; none is named on the page.
- Router bits, workholding (clamps) and a dust solution; no page in the record includes these in the base price.
Built from what the maker's page says is included. More in what's in the box.
Cost to start cutting
| Machine | $3,160.00 |
|---|---|
| AltMill 1.5KW ER20 spindle and dust shoe kit | $925.00 |
| Ready to cut, before bits and clamps | $4,085.00* |
The AltMill takes an 80 mm spindle; this is Sienci's own 1.5 kW kit. * One or more of these prices is shown without a currency. Bits, workholding, dust collection, software and a table aren't counted; add your own in the cost estimate. Accessory prices read 1 November 2026.
Work area to scale
Features
Spindle or router
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.
Size
"49″ x 49″ working area with a max Z-height of 5.5″". Millimetres converted by me.
Published specs
From Sienci Labs's page for this machine, read 1 November 2026. Inch-to-millimetre conversions are mine.
| Spec | As published | Source |
|---|---|---|
| Price | $3,160.00* | product page |
| Price note | Shown as $3,160.00 with no currency label, which is less than the 2x4 page's $3,890.00 on the same day. Machine only. (* = currency not stated) | |
| Work area, as published | "49″ x 49″ working area with a max Z-height of 5.5″". Millimetres converted by me. | product page |
| X travel | 1,245 mm (49.0") | product page |
| Y travel | 1,245 mm (49.0") | product page |
| Z | 140 mm (5.5") | product page |
| Spindle / router | 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. | product page |
| Drive | Ballscrews on all axes | product page |
| Linear motion | HGR15 linear guides on all axes | product page |
| Frame | Described as a "rigid frame"; material not published | product page |
| Controller and motors | SLB-EXT controller with e-stop. Closed-loop steppers; "over 600IPM". | product page |
| Software | Not published | |
| Footprint | 59″ wide × 62″ deep | product page |
| Weight | 76 lb | product page |
| Warranty | 120 days from receipt | product page |
| Assembly | Not published |
Spec notes
None found on this reading.
Not published on the page: software, assembly. Owners talk about these machines on the Sienci Community Forum.
Similar machines
- FoxAlienCL-4x4$2,899.99
Photo: FoxAlien - MillRight CNCMega V 2 XXL (50x50)$4,449.00
Photo: MillRight CNC - MillRight CNCMega V 2 XL (35x35)$2,999.00Photo: MillRight CNC
Head-to-head
- Sienci Labs AltMill MK2 4x4 vs FoxAlien CL-4x4
- Sienci Labs AltMill MK2 4x4 vs MillRight CNC Mega V 2 XXL (50x50)
- Sienci Labs AltMill MK2 4x4 vs Sienci Labs AltMill 4x8
Page history
- 1 November 2026 First read from Sienci Labs's page and added to the record.
No price or spec changes recorded since then. When a figure changes, the old one is kept here with the date it was noticed.