Sienci LongMill MK3 48x30
#4 in LargeFull review
For a hobbyist who wants a rigid rail machine with a 49 by 32 inch bed for well under $2,000, and already has or will buy a trim router.
Sienci Labs $1,800$1,800
The Sienci LongMill MK3 48x30 is the better CNC router overall, rated 3.5 to 3.2. The Sienci LongMill MK3 48x30 leads on price. The Genmitsu PROVerXL 4X4 wins on work area. The Sienci LongMill MK3 48x30 costs $1,799 less ($1,800 vs $3,599).
Genmitsu PROVerXL 4X4
#8 in LargeFull review
A ball screw 4 by 4 for a garage shop that wants full sheet capacity without moving up to a 4 by 8 machine. Add the cost of a router before comparing prices.
Amazon $4,499 SainSmart $3,599$3,599
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.
Which should you buy?
- Choose the Sienci LongMill MK3 48x30 for price ($1,800 vs $3,599).
- Choose the Genmitsu PROVerXL 4X4 for work area (2,621 sq in (51.2 x 51.2 in) vs 1,568 sq in (49 x 32 in)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every large CNC router; a clear win is highlighted. How we rank explains each one.
| Factor weight | Sienci LongMill MK3 48x30 | Genmitsu PROVerXL 4X4 |
|---|---|---|
| Overall rating | 3.5/5 | 3.2/5 |
| Price 25% | 85 $1,800 | 27 $3,599 |
| Work area 15% | 48 1,568 sq in (49 x 32 in) | 100 2,621 sq in (51.2 x 51.2 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 | 100 linear rails, screw or rack drive, limit switches, closed-loop steppers |
| Warranty 25% | 0 1-year warranty | 0 1-year warranty |
Specifications
| Sienci LongMill MK3 48x30 | Genmitsu PROVerXL 4X4 | |
|---|---|---|
| Work area | ||
| Travel (X x Y x Z) | 49 x 32 x 5.1 in | 51.2 x 51.2 x 4.6 in |
| Area | 1,568 sq in | 2,621 sq in |
| Spindle | ||
| Spindle | 65 mm router or 80 mm spindle mount (router not included) | 65 mm router mount (router not included) |
| Motion and control | ||
| Frame | - | aluminum extrusion with hybrid spoilboard |
| Linear rails | Yes | Yes |
| Drive | Lead screw | Ball screw |
| Closed-loop steppers | Yes | Yes |
| Limit switches | Yes | Yes |
| Controller | SLB-LITE with grblHAL | GRBL 1.1h, 32-bit board |
| Offline controller | - | Yes |
| Build | ||
| Weight | 80 lb | 330.7 lb |
| Warranty | 1 year | 1 year |
| Released | 2026-09 | 2024-11 |