Transparent Tube/Filament/Extruder in Ultimaker 3D printers Posted July 3, 2013 Hello, The brown peek part is still intact, and i did use a tap to make it just that little bit bigger, else it was just impossible to get it all the way in. Now i could see the brass part from the other side, before i could not. (for as far as i remember) I made a small print and it looked fine, because i didnt have time. I could do a bigger print today. I dont know about the pulling force Gr5, didnt test that. How do i do that? Just to make sure thats fine. And Illuminart i have such a clip on the material feeder, but not on the extruder, maybe i have to put one there aswell, if it fits.