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Linear Rail Eggbot

Creation quality: 5.0/5 (3 votes)
Evaluation of members on the printability, utility, level of detail, etc.


3D model description

Does the world really need another eggbot? At first I didn't think so, but then I ran across Niko's eggbot design over on OpenBuilds ( and got super inspired. I loved the look of the extruded aluminum rails, but wanted a design that hid the ends and felt a little more balanced (where the egg motor was over the rail instead of being mounted off the side of it). This is my attempt - I hope this helps someone. Also, this is not a cheap project!

I used Niko's pen arm STLs so have not provided those here.

Instead of using a hardware store hinge for the pen arm, I cut out a piece of polypropylene and screwed it in. My goal was to eliminate the possibility of any slop in the mechanism. Polypropylene is a very resilient plastic for applications where it will be bent back and forth repeatedly. Mine came from a yogurt tub ;)

I'm sure I missed something, so leave a comment if something isn't clear about the design and I'll try to get back with you. However, I can't help you troubleshoot your own project or Inkscape. Be sure to read over the Eggbot Wiki over at Evil Mad Scientist

Parts from Open Builds:
2 × Low Profile Screws M5 (10 Pack) (Length: 8mm)
1 × Low Profile Screws M5 (10 Pack) (Length: 10mm)
1 × Low Profile Screws M5 (10 Pack) (Length: 20mm)
1 × Low Profile Screws M5 (10 Pack) (Length: 27mm)
1 × Button Head Screws M3 (10 Pack) (Length: 6mm) (to attach pen arm motor to NEMA motor mount)
1 × M5 Tee Nuts (10 Pack)
2 × Ball Bearing 625 2RS 5x16x5
1 × V-Slot® 20x80 Linear Rail (Length:250mm)
1 × Motor Mount Plate for NEMA 23 Stepper Motor (the NEMA 17 fits too)

Parts from Evil Mad Scientist:
1 x EiBot Board
1 x Precision Egg Coupler
1 x Aluminum Pen Arm Backer

Materials from Other Sources:
1 x M5 tap to cut threads in the end of the extruded aluminum rail
2 x NEMA17 Stepper Motors
1 x MG90R Servo
1 x 5mmx100mm shaft
2 x shaft collars (5mm bore)
1 x Knob to hold the pen (drill and tap the pen arm first according to Niko's instructions)
4 M3 screws to mount egg stepper motor
4 x little screws for the polypropylene pen arm hinge
4 x little screws to hold EiBot Board in place
9v, 1.5A Power Supply (center positive, 2.1 x 5.5 mm barrel plug)
1 x Spring (goes on the 5mm shaft to provide tension to hold the egg - I had one laying around)
1 x rubber stopper thingy
1/8" cable sleeve
1/4" cable sleeve
Heat Shrink Tubing


3D printer file information

  • Design number: 51159
  • 3D design format: STL Folder details Close
    • Back_Leg.stl
    • EiBotBoard_Box.stl
    • EiBotBoard_Box_Cover.stl
    • Nema_Mount.stl
    • Right_Tool_Rest_Part.stl
    • Side_Leg-Print_two_of_these.stl

    Learn more about the formats

  • Publication date: 2019-03-19 at 08:51
    Published to Thingiverse on: 2019-03-18 at 22:04


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