PVA not sticking on Print Bed
Hi there,
currently I'm trying to print PVA with PLA. I'm trying my first print with mostly the default settings for PVA. (1.5 full solluble)
My prints with only PLA and different colors seems to work, but the PVA doesn't stick to the print bed.
Here is an example of a first layer wit PLA:
And here with PVA:
The pva doesn't stick to the print bed. It tried with different temperatur of the print bed and nozzle:
nozzle 200, 210, 220. With 220 it starts to string, so I have to lower it
print bed: 50, 55, 60, 70, 80. The best result (screenshot) is with 60. If I lower the temperatur it doesn't stick at all. If I set the temperatur higher, it sticks only partially.
I use the following filament:
https://www.mcpp-3dp.com/products/pva/#1509707470538-78ae0ada-6f76
https://www.3dware.ch/Filament-PVA-Nature-1.75mm-500g-En.htm
Any suggestion how I can improve my result?
The temperatur of the print bed seems not to improve it any further. The PLA sticks, so I think the nozzle isn't too far away from the print bed.
The temperatur of the nozzle seems to be ok. If I set it higher it starts to string and blocks the pulley-body.
My last idea ist to prepare the print bed with a glow stick or melted PVA.
Re: PVA not sticking on Print Bed
your nozzle is too close to the bed, even the PLA print shows imperfections due to being squished too much.
Re: PVA not sticking on Print Bed
Thanks for your tipp. I changed the distance. I thought it's normal to have a bit imperfection on the first layer, because the printer use a bit more filament in the first few layers. Now the PLA first layer looks alot better.
But PVA still don't stick 🙁 sometimes it's almost good and sometimes it doesn't stick at all.
Probably will end up using Printafix
Re: PVA not sticking on Print Bed
Probably will end up using Printafix
Regular PVA glue stick does work well with most soluble support materials.
Peter.
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: PVA not sticking on Print Bed
Now the printing of the first layer works, but everything else doesn't seem to work.
I set the temperatur of the filaments to different values.
PLA is set to 200. I can't set it higher or it starts to string in the ptfe tube and selektor and I have to clean both every filament change.
I set the PVA to 200, 205 and 210 but nothing seems to work.
I will try to print the next few days again, but a few tipps about the problems would be really helpful. I also will change the PLA filament to another color, so I could see better which filament cause the problem.
A printing error guide for the MMU would be great.
I have 3 problems.
1.
2.
3.
I think number one is a simple warping error. I will set the bed temperatur to 60 and don't change it during the print and let the windows closed.
2. I think the PLA sticks on the PVA, but the PVA doesn't stick on the PLA or on itself. Is the low temperatur the reason for it? But because of the similar color it's hard to say.
3. No idea. Maybe the different temperatur of PVA and PLA? That only happens to the PVA. It starts to lower the temperatur at the wipe tower during wiping and unloading of the PVA. Maybe this cause the problem.
RE: PVA not sticking on Print Bed
@kevin-w18
I have the same problem. Did you figure it out?