Eggbot pen arm top for Edding 3000 marker

thingiverse

After crafting my Eggbot by combining various sources (see the Remixed From section), I discovered that a permanent marker like the Edding 3000 wouldn't fit onto the provided pen arm top portion. To address this issue, I created an equivalent model of the pen arm top in OpenSCAD and made modifications so that the center of the pen would have the same distance from the arm pivot while accommodating the thicker (15mm) pen. Printer Settings: * Printer: Velleman Vertex K8400 * Rafts: No * Supports: No * Resolution: 0.2mm * Infill: 25% Notes: My Eggbot was printed on a Velleman Vertex K8400 that had been modified with a heated bed, using bright green no-name-brand PLA at the default settings of the printer for all parts (slow, 0.1mm layer thickness). The new pen arm top was printed in blue grey PLA/PHA by ColorFabb and used my new settings (fast, 0.2 mm layer thickness). Post-Printing: The new pen arm fits exactly where the old one did, so no extra instructions are needed - see the Finucane Derivative Eggbot for detailed construction. For electronics, I use a Chinese Arduino Uno R3 along with the Arduino CNC Shield V3.00. This setup works just fine and is relatively affordable. The overall cost of this Eggbot was approximately €50,-. In the Eggbot Control extension of Inkscape, I reduced the speed of the pen arm up/down movements to accommodate the larger weight of the Edding 3000 marker pen. Eggbot writing on a field hockey ball How I Designed This: The OpenSCAD source file is available in the Thing Files section. While it's not fully parameterized, the structure of the elements makes it relatively easy to recognize which part does what and should be straightforward to modify for other pen sizes.