About this 3D model

This is based on MendelMax J-Head Micro-Extruder V5 but completely rewritten in OpenSCAD and slightly modified for Kossel: * Two 623 (3x10x4mm) bearings to support the drive gear, attached with M3x20mm. * 16mm GrooveMount (compatible with J-Head and MakerGear). * M4 mounting screws, 50mm center-to-center. * Hotend exactly centered.