Hi Yoter,
thanks for your reply. I have looked into te TAZ printhead, and it seems quite bulky and heavy. Not that my own design is going to be a small featherlight thing but still... Also i saw on the lulzbot website that it's not advisable to print rigid filaments with the extruder that is design for the flexible stuff. I would like to keep the option of printing rigid filaments too.
I have begun designing a printhead with the bondtech extruder and two hotends. This is going to weigh around 500 grams, so I'll have to calculate how much the guiding rods will bend under this weight. I'd like to keep the maximum vertical displacement as a result of bending under 20 micrometer. The original setup, with the 6 and 8 mm rods bends around 17 micrometer with the original printhead, so it looks like i'm also going to have to place some thicker rods. rods bends around 17 micrometer with the original printhead, so it looks like i'm also going to have to place some thicker rods.