Now that I have my new FLEKS 3D build plate and my prints actually adhere while printing. I decided to test colorizing my filament on the fly. I did some research on the internet and found that others had successfully used colored felt markers to colorize filaments. I set about testing various markers and settled on Sharpie chisel tip markers due to the larger tip size, easy availability, color choices, and all plastic construction. I used my 3D cad software and designed a part that would mount easily to my Robo 3D R1+ printer. It holds a marker, and has a through hole for the filament to pass through. My previous attempts had failed during the print process due to the failure of the part to adhere to the bed. Thanks to FLEKS 3D plate that problem is now a thing of the past. The attached photos show the Robo 3D Filament Colorizer I designed, It works better than I exprcted and even allows changes of color at will without reloading the filament. I usually try to stock white ABS filament and most recently purchased a spool of Taulman N-Vent clear transparent filament and am pleased with its performance as it has less warpage than ABS does. My initial tests with coloring clear N-Vent were quite successful, and the material appears as a translucent color. The filament colorizer mounts in the filament slot at the top of the Robo and can slide to any position, the filament is fed throught the colorizer and into the extruder in the usual way. The marker has to be slighrly modified by using a razor blade to bifurcate the felt tip to create a slot for the filament to go through, then the marker is inserted into the colorizer so that the felt tip surounds the filament riding in the slot. As the filament moves through the marker tip the ink transfers to the filament and is absorbed changing the color. When the filament is melted in the extruder the color mixes into the plastc creating a colored extrusion material the solvent in the marked is boiled away leaving just the color. Even though the filament may not be completely covered with color when exiting the colorizer the extruder mixes the color thoroughly into the resultant extrusion and the color becomes integral with the printed part. The filament material appears unaffected in its properties except for the color. I can now print a variety of colors using a limited selection of filament colors (clear, white). And with a little extra effort to pause a print at various points and clear the extruder I could change colors during a print and produce multi-colored parts with a single extruder.