Just added a Bambu H2D to our fleet (own other Bambu products) primarily to run carbon fiber filaments. Our first print is with the PPS-CF. We pre-treated the filament in our Sunlu dryer at 110C for 12hrs and I now have it still drying at that temp and running directly out of the Sunlu unit to the left extruder. There is a spot about 2-3" above where the tube actually enters the extruder that the filament is struggling to bend. I was able to disconnect the tube to get the filament fed, but shortly into the build the filament snapped there as it’s being flexed at a pretty good angle when printing the part.
What are ya’ll doing to create a more gradual path for the filament tubes for these stiffer materials?
Use a printed glass riser. This gives you an inch or two more space between the glass and the toolhead, and then you can unclip the PTFE and let it give itself a more gradual angle down into the extruder. Some people also use a printed guide on the toolhead itself, but I’ve not found it necessary. I dont have an H* but this is how I mitigate this on other coreXY machines (ECC, P1S)
You can also try to put in a slightly longer PTFE tube so it has more slack when the tool head is in the front corner, the extra slack will make it a less severe turn. Ive had no problems with PPS breaking after I swapped the tube to a longer one.