Railcore® II 300ZLT Kit

$1,040.00 $2,039.99

In stock, please two weeks for packing/shipping. Free shipping in the continental US.

We have worked with Railcore Labs to bring you the Railcore II 300ZLT Kit! 

The Railcore II 300ZLT is a CoreXY based, open source 3D printer. Its features include a robust design, lightweight and stiff motion system, premium hot end, and cutting-edge automatic calibration features. The kit comes complete with all the components needed to complete your printer from the aluminum stepper brackets from to the 3D printed parts. All printed structural printed parts are printed out of Carbon Fiber PETG and Carbon Fiber ABS. Non structural parts are printed out of Veracity Blue PLA. 


    • CoreXY motion system
    • 300 x 300 x 600mm build volume (11.8" x 11.8" x 23.6")
    • Outer dimensions: 18.5" deep, 24" wide, 24" tall + 6" for cable bundle
    • 1.75 mm filament
    • E3D V6 Ultimate edition with 0.4mm NozzleX and 40w heaters or Slice Engineering Mosquito with 0.4mm vanadium nozzle and 40w heater.
    • Layer height down to 0.01 mm
    • Faster printing: 200+ mm/s
    • Max Hot End Temperature: 290°C (Optional PT100 or K-type thermocouple to reach 400C)
    • Bed specifications: 6mm thick MIC6 aluminum, 750w heater.
    • Max Bed Temperature: 120°C
    • Input power: 120VAC, 10A, 50/60Hz, optional 240VAC/5A
    • Supported materials – PLA, ABS, PETG, TPU, TPE, PP, HIPS, Ninjaflex, Laywood, Laybrick, Nylon, Bamboofill, Bronzefill, ASA, T-Glase, Carbon-fiber filaments, Polycarbonate, and more!


    • Duet 2 Wifi/Ethernet motherboard with Duex5 Expansion, so toolchanging can be implemented
    • Quiet Trinamic drivers with 256x microstepping
    • Genuine Gates belts, pulleys, and idlers
    • True automatic bed leveling/tramming
    • Bondtech BMG extruder - filament is driven from both sides
    • BLTouch Probe
    • Keenovo Heated Bed
    • Aluminum X carriages, Stepper and idler mounts machined from 6061 alloy by Mandala Rose Works
    • Meanwell LRS-200-24v Power Supply (24v, 8.3A)
    • LDO or Misumi linear rails available
    • T8x4mm pitch lead screws with Delrin Nuts
    • LDO 0.9 degree steppers for X,Y, Z and Extruder
    • Complete, labeled wiring harness
    • All 3D printed parts included
    • Compatible with an optional filament sensor (magnetic or laser) 

    In order to limit the use of printed parts as structural components, the kits come standard with aluminum stepper motor mounts, idler mounts and X-axis carriages from Mandala Rose Works. The aluminum beds are milled out of MIC 6 plate to ensure it is has excellent flatness. As of May 2021 the frame extrusions are black - updated product photos to come.

    We are shipping a complete plug and play wiring harness system with each kit. You no longer have to deal with cutting stripping and crimping your own wires. You will get all components and hardware needed to build the printer, from linear rails to nuts and bolts. All you need is the tools and the time.

    A portion of all sales go to J. Steve White and Tony Akens, the guys behind RailcoreLabs who created the open source Railcore project.

    For a quick reference on which parts are included vs options and aluminum vs printed on which model, please see the below graphic: 


    ZL/ZLT Kit Comparison
    300ZL Kit 300ZLT Kit
    Hotend Mount CF PETG* CF PETG*
    Z-Brackets CF PETG Aluminum
    Z-Yokes CF PETG Aluminum
    X-Carriages Aluminum Aluminum
    Stepper Mounts Aluminum Aluminum
    Idler Mounts Aluminum Aluminum
    PanelDue Optional Optional
    Magnum Idlers Optional Optional
    Misumi Rails Optional Optional

    *(Aluminum on Revo Micro)

    Rail Options

    • BYOR: This option comes with no linear rails, linear rails are mandatory but this option exists if you wish to supply your own.
    • LDO: An economical choice, LDO rails offer good quality at an affordable price. Every linear rail set is tested to ensure they are up to the task.
    • MiSUMi: A premium choice, MiSUMi linear rails are known for their excellent quality. These are used on the X/Y axes on the ZLT, with LDO rails used on the Z axis.

    Hotend Options

    • BYOH: This option comes with no hotend but it will include an E3D Premium Heater and thermistor to maintain the plug and play feature of the wiring harness. Note that no hotend mount is included if this option is selected.
    • V6 Ultimate: The V6 Ultimate comes with a plated copper block, E3D Premium Heater, thermistor and 0.4mm NozzleX.
    • Revo Micro: the Revo Micro comes with a 0.4mm nozzle, and quick, tool-less nozzle changing technology. An aluminum mount is included for this option.
    • Mosquito: The Mosquito comes with an E3D Premium Heater and thermistor with a 0.4mm Hardened Steel Nozzle
    • Mosquito Magnum: The Mosquito Magnum comes with a E3D Premium Heater and thermistor with a 0.8mm Hardened Nozzle for large prints. 

    Electronics Options

    • Duet 2 Wifi: The Duet 2 Wifi is a market-leading control board, with wifi support.
    • Duet 2 Wifi External Antenna: Like the Duet 2 Wifi, but with an external, mountable antenna for better signal strength.
    • Duet 2 Ethernet: Like the Duet 2 Wifi, but with an ethernet connection instead of wifi.

    Display Options

    • None: No display, though you can use the much-praised Duet Web Control from a phone, tablet, or computer.
    • PanelDue 5i: A 5" LCD touchscreen display for interfacing with the printer. Duet Web Control is still available. Printed mount not included, but many options are available. Here is one.
    • PanelDue 7i: A 7" LCD touchscreen display for interfacing with the printer. Duet Web Control is still available. Printed mount not included, but many options are available. Here is one.

    Bed Options

    • Standard: The standard bed is a 1/4” sheet of K100S/5083 aluminum, no PEI is included.
    • Magnetic: The standard bed is a 1/4” sheet of K100S/5083 aluminum with pockets machined for 9 high temperature, high strength neodymium N42SH magnets. It does not include a build surface. We recommend Buildtak's removable build surfaces, size 332mm x 340mm

    Power Options

    • 120vAC/US plug: Comes with a standard US plug and 120v bed heater.
    • 240vAC/EU plug: Comes with a standard EU plug and 240v bed heater.

    Tools Required to Complete the Build

    • Hex Wrenches 2mm, 2.5mm and 3mm
    • Philips Head and Flat screwdriver
    • Flush Cutters
    • Red RTV for mounting the bed thermistor.
    • Soldering iron or similar for installing press-fit inserts into printed parts



    Railcore® is a registered trademark of Railcore Labs, LLC.