Its just a basic natural clay slurry, only had the half a day with it, tried nutella first. had trouble setting steps per mm since there's no real info on it with that gearing, but moved down to 1/4 microstepping from 1/16th and tried between 700-1300steps per mm just to get it going. but was def over extruding, had retracts turned off so there's a lot of room for tuning.
noticed that the tubing swells a lot under pressure and was thinking of trying different tubings like ptfe or water line.
also managed to blow up my first syringe like a balloon due to a clogged nozzle when i was away. really impressed with the torque it has.
anyway i'll gladly share results when i get back to it.