Image: Sienci Labs
Sienci Labs AltMill MK2 2x4
Sienci Labs
Best for: Shops that want AltMill rigidity but do not have room for a 4x4 footprint
Typical starting price
$3,890Editorial baseline for this machine
Overall score
Best current buying path
Where to buy
Prices change often: compare the stores below
- Shipping varies by retailer
- Check manufacturer site for availability
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Quick verdict
The 2x4 is the entry into the AltMill platform and keeps everything that makes the machine interesting: HGR15 rails, ball screws on all three axes, closed-loop steppers and grblHAL. What you give up is width. At only 400 dollars less than the 4x4 it is worth thinking hard about whether the footprint is really the constraint, because the 4x4 is a lot more machine for a small step up in price.
Who this fits best
Shops that want AltMill rigidity but do not have room for a 4x4 footprint
Buy this if
Shops that want AltMill rigidity but do not have room for a 4x4 footprint. Same industrial motion system as the 4x4 in a smaller footprint.
Skip this if
Spindle sold separately, and narrow 2 foot X axis limits sheet work.
What else you still need
A spindle (sold separately, 1.5kW or 2.2kW), a VFD-ready power circuit, dust collection and a frame or table.
Material reality check
Ball screws and HGR15 rails make it properly capable in aluminium, and easy in wood. The 2 ft X axis limits full sheets.
Better alternative if...
you need full 4 x 4 ft capacity. See Sienci Labs AltMill MK2 4x4
Where it wins
- Same industrial motion system as the 4x4 in a smaller footprint
- Ball screws and HGR15 rails on all three axes
- Closed-loop steppers with auto-correction
- Free gSender software
- Lower entry price into the AltMill platform
Where it falls short
- Spindle sold separately
- Narrow 2 foot X axis limits sheet work
- Still heavy and a substantial build
- Two to three week lead time
- Price advantage over the 4x4 is small relative to the area you give up
Specifications
610 × 1220 mm
7442 cm²
2200W
80mm mount, spindle sold separately: 1.5kW or 2.2kW
SLB-EXT running grblHAL with closed-loop steppers
85 kg
$3,890
premium
Full specification table
Relative to database
Benchmark Scores
Overall Score
Composite across 5 dimensions
Community Sentiment
We have not summarised owner feedback for the Sienci Labs AltMill MK2 2x4 yet, so this section is intentionally left without claims. Check the sources for current owner discussions.
Community sentiment is aggregated from forums, Reddit, Discord, and manufacturer communities. Individual experiences may vary.