I made the adapter and inserted it into my Lulzbot Mini. I set the speed to 15mm/sec and the temp to 230 for Ninjaflex Concrete, which has something in it to give it a granular appearance. The printing is excellent - as good as printing with PLA for 0.250mm resolution. I haven’t used the Lulzbot profile for Ninjaflex.
Lulzbot does not support this and says that any damage is not convered under the warranty. I asked what damage, and they said clogging the nozzle and damaging it during cleaning.