Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!
by kraegar, published
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RailcoreII is a Core-XY based Reprap 3d printer designed by J. Steve White & Tony Akens. The initial idea to collaborate on a printer started in the #RepRap IRC channel, and centered on some common goals we both had in mind for a new printer design.
Core-XY motion. All Linear rails for movement Space & Cost Efficient, enclosable frame Key components being printable, or able to be milled Flexibility and Scalability in the design A professional looking printer Self Sourced and Easily customizable
Steve had previously built the “railcore”, the “alpha” version of this printer. We took what he’d learned from it, and began the design on the new printer. All design work was done in Fusion360.
As we progressed, we decided to “publish” this printer in an open, documented format for others to build as well.
The frame is designed to be 1515 aluminum extrusion. This was a space efficient choice, and it makes building the printer easy, as standard M3 hardware works like a T-Nut, fitting into the extrusion nicely. To add rigidity, we use melamine sides to stiffen the frame. (These can be cut out of any material you prefer, including plywood, acrylic, aluminum, etc). The total cost for the actual frame components (Extrusion, corner cubes, and sides) is roughly $100.
From there, some key design decisions were to make the build volume a 250mm cube. This kept the total printer size to what we considered reasonable. The design is easily expandable to 300mm cubed, and a new version at these dimesnions is forthcoming. Some notable aspects of the design: dual leadscrew Z-Axis with a belt drive between them, Stacked idlers duo-planar belt path, and lots of flexibility. The electronics in the design are the Duet (Wifi or Ethernet), 24v PSU, 0.9 degree steppers. We used an E3D v6 for the design, as it’s the most common hotend at this time. Support for other hotends will be forthcoming (needing only a different Y carriage). Semi-Direct drive or full bowden is supported.
A special thanks to Filastruder, Duet3d, E3D, SeeMeCNC, and 713Maker for supporting the project.
Link to the Bill of Materials For the 250^3 & 250^3 with Z-leveling versions:
Full CAD assembly in Fusion 360 for the 250^3 version: http://a360.co/2z30VXH
Link to the Assembly Guide for the 250^3 version:
There's an optional "ZL" build, to add 3 point automatic bed leveling: https://www.thingiverse.com/thing:2765693
Link tot he assembly guide for the 250^3 version with Z-Leveling:
Link to the Fusion 360 model of the 250^3 version with Z-Leveling:
BOM For the 300 & 300ZL Version: https://docs.google.com/spreadsheets/d/1ePSq-bL4-4rGUdbzkxtMmNftXPYwv5IH47edacloU4E/edit?usp=sharing
Fusion 360 model for the 300^3 Version: http://a360.co/2BZLzTA
Assembly guide for the 300^3 version:
Fusion 360 model for the 300ZL Version: http://a360.co/2D5OryV
Assembly guide for the 300^3 version with Z-Leveling:
Gallery of sample prints: https://imgur.com/a/QNLli
Facebook discussion group for RailCoreII builders & owners: https://www.facebook.com/groups/RailCore/
Forum for RailCore discussion FAQ, and build logs: http://forum.seemecnc.com/viewforum.php?f=116
10/23/17 Update: Almost all the files renamed to match the BOM and documentation better. Orientation of all models fixed to show how to best print them.
2/11/18 Update: Front & Back X carriages updated, Front and Back Stationary Idler Carriers updated.
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RailCore II by kraegar is licensed under the Creative Commons - Attribution license.
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