Image: Sienci Labs
Sienci Labs AltMill MK2 4x8
Sienci Labs
Best for: Small production shops cutting full sheets who want industrial capability below industrial pricing
Typical starting price
$10,390Editorial 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 4x8 is the full sheet AltMill and the one that competes directly with Avid and CAMaster. Sienci switches to rack and pinion on the long axis, which is the right engineering call at 2.4 metres where a ball screw would whip. Everything else carries over: HGR15 rails, closed-loop steppers, grblHAL and free gSender. Budget for the spindle separately and for the space, because this is a 230kg machine.
Who this fits best
Small production shops cutting full sheets who want industrial capability below industrial pricing
Buy this if
Small production shops cutting full sheets who want industrial capability below industrial pricing. Full 4 by 8 foot sheet capacity without tiling.
Skip this if
Very large footprint and 230kg of machine, and rack and pinion gives up some precision to ball screws on the long axis.
What else you still need
A spindle, a dedicated floor space and frame for 230kg, dust collection and a high-current circuit.
Material reality check
Full sheets of plywood and MDF are the point, with aluminium well within reach. Rack and pinion on the long axis gives up a little precision to ball screws.
Better alternative if...
you do not need full sheets and want to spend less. See Sienci Labs AltMill MK2 4x4
Where it wins
- Full 4 by 8 foot sheet capacity without tiling
- HGR15 industrial rails throughout
- Rack and pinion on the long axis, which is the correct choice at this length
- ATC spindle option available
- Still meaningfully cheaper than an equivalent Avid or CAMaster
Where it falls short
- Very large footprint and 230kg of machine
- Rack and pinion gives up some precision to ball screws on the long axis
- Spindle sold separately
- Significant assembly project
- Needs proper dust extraction and a dedicated space
Specifications
1220 × 2440 mm
29768 cm²
2200W
80mm mount, spindle sold separately: 2.2kW or 2.2kW with ATC
SLB-EXT running grblHAL with closed-loop steppers
230 kg
$10,390
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 4x8 yet, so this section is intentionally left without claims. Check the sources for current owner discussions.
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