Secure, position, and repeat your laser engraving setups with a versatile fixture system built for M4 threaded work surfaces.
The Geeks At Large M4 Premium Steel Fixture & Jig Kit provides a flexible collection of positioning stops, brackets, bars, and slide blocks for securing and aligning workpieces on compatible laser engravers. Designed around the M4 work surfaces used by the xTool F1 Ultra, F2 Ultra, F2 Ultra UV, and Creality Falcon A1C, the oversized slots also allow the fixtures to adapt to a wide range of other M4 threaded grids.
Each fixture is manufactured from 5 mm steel and finished with a durable black powder coating. The substantial steel construction provides a solid positioning reference while remaining low enough to minimize interference with typical galvo engraving setups.
Unlike fixed jigs that only work with a particular object, the M4 Premium system can be rearranged for different workpieces, allowing you to create repeatable corners, straight edges, positioning stops, rotary supports, and custom fixture arrangements.
More Freedom Than the Threaded Grid
The elongated mounting slots allow the fixtures to move independently of the exact location of the machine’s threaded holes. Straight bars can be adjusted across their narrow axis, helping place an edge or stop exactly where it is needed.
The kit also introduces two sizes of slide blocks, which provide adjustment along their broad axis. These are especially useful when positioning larger objects, supporting the base of a rotary attachment, or creating a stop where the machine’s M4 grid doesn’t conveniently align with a traditional straight or L-shaped fixture.
This combination makes it much easier to position the fixture around the workpiece rather than forcing the workpiece to conform to the available mounting holes.
Designed for M4 Laser Work Surfaces
The kit is designed for:
xTool F1 Ultra
xTool F2 Ultra
xTool F2 Ultra UV
Creality Falcon A1C
The slotted design can also accommodate many other machines and work surfaces equipped with M4 threaded mounting holes. Because M4 grid layouts vary between manufacturers, fit and available adjustment may vary. The slide-block slot geometry is specifically optimized for the xTool M4 grid, although the blocks can also be used in other fixture arrangements.
Creality Falcon A1C Low-Profile Hardware Included
The Falcon A1C’s autofocus Z-probe extends below the laser head and can interfere with standard thumbscrews even when the workpiece itself sits above the fixture.
For this reason, the kit includes 10 low-profile M4 mounting screws and a matching wrench in addition to the standard thumbscrews.
Important: Always verify laser-head and Z-probe clearance before focusing or starting a job. Low-profile hardware reduces potential interference but does not guarantee clearance with every fixture arrangement.
What’s Included
The kit includes 14 black powder-coated 5 mm steel fixture pieces:
| Qty | Fixture |
|---|---|
| 2 | 55 mm L Brackets |
| 1 | Sphere Bracket |
| 2 | 69 mm Bar Brackets |
| 1 | 120 mm Cross Bracket |
| 1 | 100 mm L Bracket |
| 2 | 100 mm Bar Brackets |
| 1 | 40 mm Half-Circle Fixture |
| 2 | 46 mm Slide Blocks |
| 2 | 116 mm Slide Blocks |
Also included are 10 M4×8 thumbscrews, 10 low-profile M4 screws, and one wrench for the low-profile hardware.
The M4 Premium Fixture Kit is a reusable, configurable alternative to making a dedicated jig for every engraving job—particularly useful for repeat work, batch production, rotary positioning, and setups where precise placement matters.
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