Linear Rail Eggbot Derivative

thingiverse

Does the world really need another eggbot? At first, I thought not. But then I stumbled upon Niko's eggbot design over on OpenBuilds and was super inspired. The extruded aluminum rails looked amazing, but I wanted a design that hid the ends and felt more balanced. This is my attempt - hopefully, it will help someone else out. I used Niko's pen arm STL files, so you won't find them 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 any slop in the mechanism. Polypropylene is a great plastic for applications where it will be bent back and forth repeatedly. Mine came from a yogurt tub - yeah, I know! I'm sure I missed something, so leave a comment if you're not clear about the design and I'll try to get back to you. However, I can't help with troubleshooting your own project or Inkscape. Be sure to read over the Eggbot Wiki at Evil Mad Scientist. Note: A Google Sketchup file is included for reference. **Original Size Images** Front View: https://thingiverse-production-new.s3.amazonaws.com/assets/13/be/f5/6d/a7/Front.jpg Side View: https://thingiverse-production-new.s3.amazonaws.com/assets/fb/87/08/57/09/Side.jpg Bottom View: https://thingiverse-production-new.s3.amazonaws.com/assets/ce/59/f7/c6/a2/Bottom.jpg **Video** https://youtu.be/qzW1a53-I5U **Parts from Open Builds** 2 × Low Profile Screws M5 (10 Pack) (Length: 8mm) https://openbuildspartstore.com/low-profile-screws-m5-10-pack/ 1 × Low Profile Screws M5 (10 Pack) (Length: 10mm) https://openbuildspartstore.com/low-profile-screws-m5-10-pack/ 1 × Low Profile Screws M5 (10 Pack) (Length: 20mm) https://openbuildspartstore.com/low-profile-screws-m5-10-pack/ 1 × Low Profile Screws M5 (10 Pack) (Length: 27mm) https://openbuildspartstore.com/low-profile-screws-m5-10-pack/ 1 × Button Head Screws M3 (10 Pack) (Length: 6mm) (to attach pen arm motor to NEMA motor mount) https://openbuildspartstore.com/button-head-screws-m3-25-pack/ 1 × M5 Tee Nuts (10 Pack) https://openbuildspartstore.com/tee-nuts-m5-10-pack/ 2 × Ball Bearing 625 2RS 5x16x5 https://openbuildspartstore.com/ball-bearing-625-2rs-5x16x5/ 1 x EiBot Board https://shop.evilmadscientist.com/productsmenu/188 1 x Precision Egg Coupler https://shop.evilmadscientist.com/51-products/accessories/208-coupler 1 x Aluminum Pen Arm Backer https://shop.evilmadscientist.com/51-products/accessories/702-albacker **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 https://www.amazon.com/gp/product/B076XW73Q7/ 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 https://www.amazon.com/gp/product/B071G5L29C/ 1/4" cable sleeve https://www.amazon.com/gp/product/B071JH14WZ/ Heat Shrink Tubing **Software** Inkscape http://inkscape.org/en/