Pen Adapters for EB2020 and EggBot

thingiverse

This is an improved version of my pen adapters ([thing:4811668](https://www.thingiverse.com/thing:4811668)). They are now round which should provide a nicer clamping of the pens. This design is used by my EggBot derivative [EB2020](https://www.thingiverse.com/thing:5702636). But they also can be used with your EggBot. The property of the adapters are: * the tip of the pen always is centered * the tip of the pen is always at same distance * the pens are not damaged by screws when inserted into the EggBot Altogether this allow you to use pens from different manufacturers within one drawing. How it is designed & built -------------------------- The outer diameter of the adapters is 14 mm. The stop of the adapters are designed to have the tip of the pen in a distance of 35 mm measured from the top of the pen arm. When designing a new adapter for your pens, the hight of the adapter should be such that the tip of the pens sticks out exactly 35 mm. For the inner diameter use the pen diameter +0.3 mm. For adaption to your EggBot please use the PenArm_withoutJoint. You need to modify the length of the arm and add a joint to its end that fits to your EggBot hardware. After printing, cut a M4 thread and then glue in a M4x25 mm allen screw (fasten with care). Add a M4 knurled thumb nut. How to use ---------- Finding the adapter that fits to your pen is usually easy. For most pens you just need to select the adapter in which the pen (due to its diameter) can be inserted. The only exception I found so far was for Sharpie Fine Point markers where my marker set has two different tip lengths. In case of doubts, you can use the adapter tester to find the adapter with the proper length: Insert the adapter and pen. If the pen just touches the paper then it fits. | __Pen__ | __Pen Diameter__ | __Tip Length__ | __Adapter Length__ | __Model__ | |--------------------------------|------------------|----------------|--------------------|-----------| | Sharpie Fine Point | 10.7 mm | 36 mm | 1 mm | PenAdapter(FinePoint)L36.stl | | Sharpie Fine Point | 10.7 mm | 37 mm | 2 mm | PenAdapter(FinePoint)L37.stl | | Sharpie Ultra Fine Point | 9.7 (- 10.0 mm) | 43 mm | 8 mm | PenAdapter(UltraFinePoint).stl | | Sharpie Metallic (water based) | 10.2 mm | 39 mm | 4 mm | PenAdapter(Metallic).stl | | Acrylic Pens | 11 mm | 24.5 mm | -10.5 mm | PenAdapter(Metallic2)L24,5.stl | | Sacura Pigma Micron | 9.4 mm | 30 mm | -5 mm | PenAdapter(PigmaMicron)L30.stl | | Pencil (hexagon) | 7 mm | -/- | -/- | PenAdapter(Pencil7).stl |