Railcore II 300ZLT
Railcore II 300ZLT

RailCore Labs

Aside from inherent funtionality and aesthetics of your 3d printer build, a good reason DIYer’s decide to take on a new build can be attributed to the machines after-market parts. Many makers want upgradability and the means to customize 3d printers to fit our needs and preferences. The beauty of the Railcore printer is that you can not only configure your build to suite 3d printing requirements.

The RailCore Printer is an easily hackable and customizable corexy design that successfully impliments 3 point bed leveling. Designed to use X, Y and Z-axis linear rails, the RailCore also is available with machined aluminum parts. The Duet bed leveling with automatic bed tramming makes a perfect first layer.

We first discovered RailCore Labs and the open-source corexy design at MRRF 2019. The Railcore 3d printer was designed by designed by Tony Akens and J. Steve White when discussing an idea of a core xy printer with linear rails on the x,y and z-axis on Reprap IRC.

The Railcore is a 3d printer designed with 15mm extrusions for the printer frame to bring down the cost. 15mm Extrusions use m3 hardware which is much cheaper when compared to m4 or m5 hardware. Although 15mm extrusions and m3 hardware may be less rigid the printer gains it’s rigidity from the reinforcement of the side panels. Many more design decisions were made to make the printer build as space efficient as possible while maximizing build volume. The printer build gains it’s rigidity

RailCore Mechanical Arrangement at MRRF 2019
RailCore Mechanical Arrangement at MRRF 2019

RailCore II 300ZL

The original Railcore printer is no longer available due to the updated 300 ZL and ZLT version. But here’s the details:

  • Linear Rails XYZ Axis
  • 300mm x 300mm x 330mm Build Area
  • ZLT is 300m x 300mm x 600mm Build Area
  • Auto Leveling
  • Hotend: E3D V6 or Mosquito
  • 0.9 Degree Steppers
  • Hardware: 3D Printed Parts or Machined Aluminum Upgrades


One of the nice things about the Railcore is the ecosystem up aluminum upgrade parts. 713Maker manufactures a variety of CNC machined aluminum parts such as motor and idler mounts. Mathew from 713 Maker also manufactures aluminum heat bed plates and a halo. Hopefully soon we’ll see some carbon fiber upgrades available. Mandala Rose Works offers a kinematic mount kit. The upgrade kit gives you the option to mount the z-yoke and bed to a kinematically coupled system. This setup is based on the Kelvin style kinematics and is better suited to handle the thermal expansion of your bed as it heats up.

Tool Changer

If you follow E3D you’re most likely aware of the tool changing platform. Printers shipped out by Project R3D use the DuetX5 expansion board instead of the DuetX2 board. Joseph Podgorski stated that the expansion board will give RC users the hardware needed to implement the tool changing concept once developed. Project R3D has been one of the main RailCore manufactures but Printed Solid has recently became reseller recommended on the Project R3D website.

Tony Akens explained in a fb post that the railcore wasn’t designed for a toolchanger. RailCore Labs plan to retro-fit the E3D Tool Plates but it’s not built for tolchanging. Tony goes on to suggest that one would have to modify the printer and change how the RailCore works. He explains that bolting on components is easy by design but may complicate the RailCore bed leveling. He suggests that the Jubilee is somewhere in between the RailCore and the E3D ASMBL but has future plans to work with Joshua Vasquez the creator of the Jubilee.

Railcore 2020

As of now the RC is only available with a 15mm extrusion frame kit. But the printer is designed to be modular and scalable . One of the limitations to increasing the size of the printer is frame rigidity. I predict that we’ll soon see a 20mm x 20mm version of this printer.

Large RailCore

Large RailCore 3d Printer
Large RailCore 3d Printer

There may not be a 20mm x 20mm frame extrusion available but Anthony Wheeler from Sign Monkey built a custom large RailCore build with a 30mm x 30mm extrusion and Nema 23’s stepper motors.

Large RailCore Z-Axis Yoke
Large RailCore Z-Axis Yoke

Here’s the z-axis setup for Anthony’s large scale RailCore Build. Those custom Nema 23 motor mount brackets are the best I’ve seen so far.

RailCore Bed

RailCore Bed
RailCore Bed
Railcore 3D Printer Build at Midest RepRap Festival Project R3D Booth

Related Content

  • Belt Frequency And Tensioning
    Loose belts are a common problem for users and cause a variety of issues. It may or may not be obvious that your 3d printer is experiencing issues. Belt tensioning defects can occur.
  • Duet 2 vs Duet 3
    While a Duet 3 won’t be replacing the Duet 2 anytime soon, it’s a much more professional electronics board that adds a range of options and functionality to your machine build. Although the Duet 3 may be overkill for most users, these options are not for everyone you do get much more out of Duet
  • Best CoreXY 3D Printers 2020
    Is CoreXY better? What is the best 3d printer to start with? We review the newest coreXY 3d printers of 2020.
  • Best CoreXY Designs on Thingiverse
    While there are many open source 3d printer designs to pick from on Thingiverse. And when it comes to corexy printer designs there are a few that raise the bar. Here are some of the best designs that we would like to talk about.

SolidCore ToolChanger

Although this page will be used to document and collect resources to implement a toolchanger on the SolidCore printer, we’ve only completed one so far …
Read More
SolidCore CoreXY 3D Printer

SolidCore CoreXY 3D Printer

Modular Scalable Linear Rails Balanced Carriage Pull Enclosure BOM utilizes most available parts All Metal Parts or 3D Printed Z-Axis: Independent Driven or Shared Belt Routing
Read More


*For Complete Transparency* It’s been taking up to two months to ship out SolidCore Kits to the first users. The official release will be 5/4/21. …
Read More
Belt Frequency And Tensioning 3

Rapid Event TCT

Rapid + TCT Although there are many 3d printing and additive manufacturing conventions, there is nothing better than Rapid Event. The RAPID + TCT conference, also …
Read More


CAD/CAM Tutorials Fusion 360 Fusion 360 CAM – Lathe Basics Read More Lathe Parts: Spun Profiles & Center of Rotation Fusion 360 CAM see Fusion 360 CAM – 1.5″ Compressor …
Read More
WorkHorse XL 3D Printer 600x600x600 Build Volume

WorkHorse XL

WorkHorse XL 3D Printer 600x600x600 The Workhorse XL is a larger version of the Workhorse Printer. Although the original design is modular and made to be …
Read More

WorkHorse 3D Printer-Frame

Workhorse Frame Extrusions The frame of the Workhorse 3D Printer is made out of 2020 and 2040 aluminum extrusions. We use Misumi profile but most 20mm …
Read More
Machining keyway Slots

Machining Keyways And Keyseat Slots

Keyway and Slot CAM toolpath CNC Mill Keyways & Keyseats Key and Keyway Applications PulleysSprocketsOther rotating assemblies that transfer motion Purpose of Keys and Keyways A designed sheer point or …
Read More
Belt Frequency And Tensioning 5


Houston based machine shop manufactures 3d printers and 3d printer parts.
Read More

Esprit CAM Tutorials

Esprit CAM Tutorial-Creating & Adding Tools Esprit Lathe Tutorial-Drawing 2D Geometry Esprit CAM Tutorial- Creating & Setting Up Lathe Stock ESPRIT Mill Tutorial- B Axis Setup Esprit CAM Tutorial: …
Read More
Belt Frequency And Tensioning 6

Industrial 3D Printers

Metal 3D Printer Additive Manufacturing or AM rapid prototyping continue to advance production 3d printing and offer solutions for manufacturers with applications in additive materials and …
Read More