Brand: Genmitsu

3040 Y-Axis Extension Kit for 3018 Series CNC Router

SKU: 101-63-YS3018 54 reviews Variants ID: 32781692076111
$53.99 $59.99 Save $6.00
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Super Size your CNC: This kit will extend your CNC’s Y-Axis to have 370mm of movement (14.6”), 320mm of travel, easily convert your 3018 to a 3040.

Compatibility: Perfectly compatible with Genmitsu 3018-PRO, 3018-MX3, 3018-PROVer, 3018-PROVer Mach3 CNC’s.

Built to suit your needs: It is designed to be a direct upgrade to the 3018 series CNC machines. The enlarged 3040 MDF Spoilboard and 3040 Aluminum Spoilboard are available now.

Simple Assembly: We will take you through the assembly process every step of the way.

Cost-Effective: Save money by putting your current CNC to better use. You don’t need to spend tons of money on a bigger one.

Note for Bakelite 3018-MX3 User: Please check the screw hole of the optical shaft part.
COUNTERBORE in the screw hole:   ▶ 3018-PROVer Series
SPOTFACE in the screw hole:  ▶ 3018-PRO
3018-PROVer Series Y-axis Extension Kit
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Expand your machine's potential with an easy upgrade that will provide over double your previous work area.

Perfect for making signs or just accommodating larger stock material for multiple cuts.

How to assemble the Extension Kit

Step 1: Disassembly

  • Disconnect & Remove All Wires Connecting to the Base of Your CNC
  • Unscrew the Gantry Assembly from Either Side of the CNC's Base
  • Take Apart Your Frame

Step 2: CNC Base Assembly

  • Attach the Extended Side Extrusions & Linear Rails to the Back Panel
  • Install Extended Lead Screw into CNC Bed Through Spring & Copper Nut
  • Install the Bed with Threaded Lead Screw Into the Liner Rails Already Attached to Back Panel
  • Secure the Lead Screw to the Y-Axis Stepper Motor through the Coupler
  • Install the Front Panel & Square Frame

Step 3: Final Assembly

The process of mating the base frame with the gantry assembly mirrors the same process as when you assembled your CNC for the first time, the only major difference is that rather than having the gantry spaced 46.5mm from the rear of the frame, you are now going to want it to move more forward in order to take advantage of the expanded Y-Axis.

Rather than give you a specific number, it is strongly suggested that you move the gantry as far forward as your wiring will allow. This is usually around 60-80mm depending on whether you have limit switches.


  • Material: Aluminum
  • Package Weight: 1.77 KG (3.90LB)
  • Package Dimension: 51.5*21.5*7.5cm
  • Note for 3018-MX3 User: Since MX3 has been upgraded before, special attention should be taken when choosing this Extension Kit. If you find a COUNTERBORE in the screw hole of the optical shaft part, please choose the Extension Kit for 3018-PROVer/3018-PROVer Mach3.


For 3018-PROVer Series:

  • 2 x Y-axis Aluminum Extrusions (2040*450mm)
  • 1 x Y-axis Extended Lead Screw (T8 Pitch 2mm, Thread 4mm*450mm)
  • 2 x Y-axis Extended Linear Rails (Hole 5mm, Depth 15mm*460mm)
  • 1 x Replacement Zip-ties
  • 1 x Assembly Instruction

For 3018-PRO& 3018-MX3 Series:

  • 2 x Y-axis Aluminum Extrusions (2040*450mm)
  • 1 x Y-axis Extended Lead Screw (T8 Pitch 2mm, Thread 4mm*454mm)
  • 2 x Y-axis Extended Linear Rails (Hole 5mm, Depth 15mm*450mm)
  • 1 x Replacement Zip-ties
  • 1 x Assembly Instruction


  • 1 x Y-axis Extension Kit + MDF Spoilboard

Note: The original limit switch cable of the 3018-PROVer is not compatible with the 3040 Y-axis extension kit. Please purchase a longer cable individually.

Assembly Guide

Customer Reviews
4.9 Based on 54 Reviews
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Filter Reviews:
Jose P.
Portugal Portugal
O que eu precisava

Ainda não tive tempo de transformar, mas acredito que vai funcionar Genmitsu 3040 Y-Axis Extension Kit for 3018 Series CNC Router Review
Sally F.
United States United States
Good quality works as expexted

The kit will not work directly with the PRO versions as the rods are too long as stated in other reviews Genmitsu 3040 Y-Axis Extension Kit for 3018 Series CNC Router Review
William J. Orr
Canada Canada
Y rail extension

Well packaged, straightforward instructions. Fair amount of dis assembly, just be patient. The extra length of axis has been nice, broadening my hobby limits.

Kristopher H.
United States United States
So far its great

Had an issue with 2 holes being untapped. Customer service was nice but I got impatient and tapped them myself. Working like a champ now

Mark E.
United States United States
Great Customer Service (again)

As I assembled my extension kit, I discovered that the two Y axis linear rails differed in length by 1mm. While I could have tightened the screws to make it fit, doing so noticeable bowed the Bakelite end pieces. I decided the shim the shorter rail with a couple M4 washers (one on each end). That seems to work fine. Just to be safe, I contacted Sainsmart customer support to make sure that was acceptable. The next morning there was a shipment notice that Sainsmart had shipped out replacements.

Julio L.
United States United States
kit de extensión Genmitsu 3040 Y-Axis para enrutador CNC de la serie 3018

Perfecto funclon y más área de trabajo

A Customer
Shane P.
United States United States
Simple install, doubles capacity

In about an hour, this was installed and working (including a separate spindle upgrade). Very pleased with this kit.

Francois O.
Strong and quality build !

Strong build and excellent component. Great and fast service. You can trust SainSmart and Genmitsu !

United States
Outstanding product

Perfect fit, easy assemblu.

Alex g.
Canada Canada

These came quickly and were super simple to attach! Defiently recommend to anyone looking