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Sienci Labs
Sienci LongMill MK2 (48x30)
$1799
Released 2022-02-01
Best Desktop Cnc Machines · head-to-head
Sienci LongMill MK2 (48x30) vs BobsCNC Evolution 4 (E4)
A sourced, side-by-side comparison. Sienci LongMill MK2 (48x30) is cheaper at $1799. Every spec and price links to its source.
BobsCNC
BobsCNC Evolution 4 (E4)
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Sienci LongMill MK2 (48x30) | BobsCNC Evolution 4 (E4) |
|---|---|---|
| US price | $1799 | — |
| Brand | Sienci Labs | BobsCNC |
| Released | 2022-02-01 | — |
| Work area x (mm) | 1219 | 610 |
| Work area y (mm) | 762 | 610 |
| Work area z (mm) | — | 84 |
| Spindle power (W) | 710 | — |
| Spindle speed (rpm) | 10,000-30,000 | 10,000-30,000 |
| Frame material | Extruded aluminum rails with UHMW/HDPE wheels, lead screw drive on all axes | Laser-cut Baltic birch plywood |
| Controller firmware | Sienci controller box (GRBL-based), gSender sender software | Arduino Uno with GRBL 1.1 firmware, custom stepper driver shield |
| Max feed rate mm min | — | 5080 |
| Repeatability (mm) | — | — |
Sources — Sienci LongMill MK2 (48x30): sienci.com (verified 2026-08-09). BobsCNC Evolution 4 (E4): mellowpine.com (verified 2026-08-09).
What's the difference between the Sienci LongMill MK2 (48x30) and BobsCNC Evolution 4 (E4)?
Where the two actually differ on the specs we track (4 of 9). Matching specs are omitted.
- Work area x (mm): Sienci LongMill MK2 (48x30) 1219 vs BobsCNC Evolution 4 (E4) 610
- Work area y (mm): Sienci LongMill MK2 (48x30) 762 vs BobsCNC Evolution 4 (E4) 610
- Frame material: Sienci LongMill MK2 (48x30) Extruded aluminum rails with UHMW/HDPE wheels, lead screw drive on all axes vs BobsCNC Evolution 4 (E4) Laser-cut Baltic birch plywood
- Controller firmware: Sienci LongMill MK2 (48x30) Sienci controller box (GRBL-based), gSender sender software vs BobsCNC Evolution 4 (E4) Arduino Uno with GRBL 1.1 firmware, custom stepper driver shield