Interactive numerical controlled egg-decorating machine

thingiverse

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