Sienci LongMill MK3 30x30
#5 in LargeFull review
For a hobbyist who wants a rigid rail machine with a 32 by 32 inch bed for well under $2,000, and already has or will buy a trim router.
Sienci Labs $1,400$1,400
The Sienci LongMill MK3 30x30 rates 3.4 among large CNC routers; the Carbide 3D Shapeoko 5.1 Pro 2x2 rates 2.9 among midsize ones. The Sienci LongMill MK3 30x30 costs $1,580 less ($1,400 vs $2,980).
Carbide 3D Shapeoko 5.1 Pro 2x2
#5 in MidsizeFull review
For a buyer with limited space who wants a rigid rail and ballscrew machine with US support. Larger beds cost less per square inch elsewhere.
Carbide 3D $2,980$2,980
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different size classes (large and midsize), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Sienci LongMill MK3 30x30 | Carbide 3D Shapeoko 5.1 Pro 2x2 |
|---|---|---|
| Overall rating | 3.4/5 | 2.9/5 |
| Price 25% | 100 $1,400 | 0 $2,980 |
| Work area 15% | 9 1,024 sq in (32 x 32 in) | 54 600 sq in (24.5 x 24.5 in) |
| Spindle 15% | 50 spindle power not published (neutral score used) | 50 spindle power not published (neutral score used) |
| Motion 20% | 100 linear rails, screw or rack drive, limit switches, closed-loop steppers | 85 linear rails, screw or rack drive, limit switches |
| Warranty 25% | 0 1-year warranty | 25 1.5-year warranty |
Specifications
| Sienci LongMill MK3 30x30 | Carbide 3D Shapeoko 5.1 Pro 2x2 | |
|---|---|---|
| Work area | ||
| Travel (X x Y x Z) | 32 x 32 x 5.1 in | 24.5 x 24.5 x 6.1 in |
| Area | 1,024 sq in | 600 sq in |
| Spindle | ||
| Spindle | 65 mm router or 80 mm spindle mount (router not included) | Carbide Compact Router (included) |
| Top speed | - | 30,000 rpm |
| Motion and control | ||
| Frame | - | custom extrusions on a rigid base frame |
| Linear rails | Yes | Yes |
| Drive | Lead screw | Ball screw |
| Closed-loop steppers | Yes | - |
| Limit switches | Yes | Yes |
| Controller | SLB-LITE with grblHAL | Carbide Motion |
| Offline controller | - | No |
| Build | ||
| Weight | 72 lb | - |
| Warranty | 1 year | 1.5 years |
| Released | 2026-09 | 2025-11 |