About this 3D model

- Inspired of the orignal egg-bot I designed a interactive variant for egg-decoration. - Designed to be easily assembled and printed (no support required if oriented properly while printing) - Controlled via serial interface (i use putty to connect, any terminal will do) - Video: https://www.youtube.com/watch?v=KuiRFXf5oMg ##Modes of operation - Direct control (move left/right, rotation forward/reverse) and pen up/down keys like an etch-and-sketch - 360 degrees patterns via simple numerical commands. ("Pattern button" followed by one to three digits do select pattern, frequency and width) ##Pen mount (alternatives) - Set-screw with captive nut - Inserts tailored for the correct pen dimension (https://www.youtube.com/watch?v=yXb-T4F5XGk) ##Bill of material - 3d printed parts (PLA) - 1 arduino (or standalone atmega328p) with serial connection to host computer - 2 driver boards (ULN2003 based) - 2 stepper motors (28BYJ48 DC 5V) (~3$ each from China incl. driver board) - 1 servo (mini 9g ~3$) - a few M4 and M5 screws, washers and nuts - a couple of screws to mount the pieces to the base plate - 1 spring - 1 rubberband - "Oogoo" (silicon and corn starch) to the paddings - baseplate in any scrap wood material (my was laminated) - pencils - (optional USB keyboard with stickers) - style cheat sheet ##Challanges - Backlash in the geared steppers was mitigated with software backlash compensation for the rotating axis and with a rubberband for the moving arm. [resolved] - Finding the perfect tention so that the egg doesn't slip (making it moving less than expected 360 degrees) [still experimenting] ## Firmware https://github.com/ahd71/incedm