Our Pick: Sienci Labs LongMill MK2 30x30
It scores 76/100 overall versus 60/100, winning 5 out of 9 comparison categories.
OpenBuilds LEAD 1515 CNC Router wins 3 of 4 spec categories. Both are similarly priced. Sienci Labs LongMill MK2 30x30 leads by 16 points overall — here’s where those points come from:
Benchmark Scores
Side-by-side score comparison across all five benchmark dimensions.
Overall
Sienci Labs LongMill MK2 30x30
Pros
- Excellent build quality with steel and aluminum construction
- Anti-backlash lead screws on all axes
- Outstanding documentation and video tutorials
- gSender software is purpose-built and beginner-friendly
- Strong community and Canadian customer support
Cons
- Router not included adds to total cost
- Assembly takes 4-6 hours
- Lead screws are slower than belt drives for rapids
- Dust shoe is an optional extra
OpenBuilds LEAD 1515 CNC Router
Pros
- Enormous 1500x1500mm work area at an unbeatable price
- Open-source design allows extensive customization
- OpenBuilds CONTROL software is free and excellent
- Massive community with years of modifications and improvements documented
- BlackBox controller is plug-and-play
Cons
- Frame rigidity is seriously compromised at this span
- V-wheel bearings wear quickly under the stresses of this size
- Belt drive introduces noticeable accuracy loss at the extremes
- Router not included and needs to be purchased separately
- Requires a very large, flat work surface
Verdict
Sienci Labs LongMill MK2 30x30 wins this comparison with 5 categories to 4.
It scores 76/100 overall versus 60/100, winning 5 out of 9 comparison categories.
Where to Buy
Price-first merchant links with the clearest reason to click first.
Sienci Labs LongMill MK2 30x30
$1200OpenBuilds LEAD 1515 CNC Router
$1100As an Amazon Associate I earn from qualifying purchases. Affiliate links may earn a commission at no extra cost.
Frequently Asked Questions
What is the difference between Sienci Labs LongMill MK2 30x30 and OpenBuilds LEAD 1515 CNC Router?
The Sienci Labs LongMill MK2 30x30 ($1200) features a 710W spindle with a 762×762mm work area and a Steel and aluminum with anti-backlash lead screws frame. The OpenBuilds LEAD 1515 CNC Router ($1100) features a 710W spindle with a 1500×1500mm work area and a V-Slot aluminum extrusion frame. Overall, the Sienci Labs LongMill MK2 30x30 wins more comparison categories.
Which is better value for money — Sienci Labs LongMill MK2 30x30 or OpenBuilds LEAD 1515 CNC Router?
The OpenBuilds LEAD 1515 CNC Router is $100 cheaper at $1100 vs $1200. Our value scores rate the OpenBuilds LEAD 1515 CNC Router higher at 88/100.
Which router is easier to set up and use?
Based on our ease-of-use benchmarks, the Sienci Labs LongMill MK2 30x30 scores higher (85/100 vs 65/100). Both support gSender, UGS, CNCjs among other software options.
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