Summary If you have a Dremel 3d20 printer and would like to install a second right-hand-side filament spool, then having a second filament guide is a must. This is simply a (uselessly accurate: I couldn't help.. Something autistic suddenly roared deep inside..) mirror image of the original guide. As a guiding tube I use the plastic tube (probably PE) from inside a empty deodorant spray can. So that that beautiful technology is allowed to live on some more years as well...