Hi
I have a double nozzle K8400 and i want to use the first nozzle for PLA or ABS and the second nozzle for a support filament. i read something about a filament called PVA that solves in water. Can a vertexc K8400 print this sort of filament? what are the settings to print this sort of filament if it is possible?
thnx
[quote=“Jan Lauwers”] if it is possible?[/quote]Actually it isn’t. It’s too soft for a Boyden extruder and you’d be clogging your nozzle. Only thing you can do is printing ABS with one nozzle and print support with PLA on the second one. You can “dissolve” the PLA with NaOH (it doesn’t rally dissolve but turn into filaments you can easily remove). If you don’t want it to take ages you’ll need an ultrasonic bath.
I’m not completely in line with Raby.
I tried to print with PVA, and there is no issue regarding the elasticity or softness of this material.
I was realizing another problem, which makes the printing a nightmare: the poor temperature control of the nozzle.
I realised, that the temperature of the nozzle is 40 to 50 degree higher than the one displayed at the LCD. In this condition the material is cracking , you can here a sparkling in the nozzle. If it is held too long at this condition, the nozzle is blocked.
If you can run a constant extrusion all is fine! Nevertheless, even in this condition the PVA can be overheated, loosing the ability to be soluble in water!
From my experience there is s strong demand of an excellent temperature control and a prevention of overheat.
I did a modification on the temperature sensor, which allows a more reproducible temperature control. First test prints are promising, but actually I’m in trouble with my slicer (Slic3r), which makes silly slices for this support material. So I’m not able to proove the overall setting yet. I need still some days to finalise this work.
Well that’s something I’ve never experienced, and imho can only occur if U haven’t mounted the thermistor correctly. I used some extra kapton tap around the sleeve where the actual thermistor sat, so when putting this into the hole it was a decent tight fit. I never broke a isolator guard or had these silly temperature readings your describing.
But thb I never printed PVA so I can’t tell anything about. Only thing I want to make a notice of is that you need to be carefully when using Raby’s “Pandy” way of removing PLA with NaOH (Lye) NaOH loves to liquefy organic material! Human tissue included! Wear decent! And I want to really hammer on this! DECENT GLOVES & EYE PROTECTION! Thick chemical resistant gloves! No teeny tiny latex surgical gloves, they can rip so easy when handling and breaking away the support!
Kind regards!
JeAfKe