Thin and large PLA plate printing problem
Hello!
I'm very new in the 3D printing world and I'm facing problem when I'm printing a thin (1.5mm) and large (90x45mm) PLA plate.
After few layers small portions of the plate lift up a bit and the plate start to move on the printing bed.
Here a picture of the moment when the plate goes off from the printing bed:
It seems to me that the adhesion between the PLA and the PEI bed is poor.
I try to use the brim but the PLA wire doesn't stick well to the printing bed so using the brim doesn't even let me start the first layer.
I use isopropholy alcohol and acetone to clean it as written in the manual.
I'm using the standard setting (Prusa control software) 215° / 60° (noozle and bed temperature).
Printing speed is 100mm/s. I've tried to reduce it at 90 and 80mm/s but no improvements.
I've started to think that the squish is not the right one so I made a test: I've printed the first layer of a small plate (40x40mm) by changing only the nozzle quote from -0.90mm (Z live adjustment quote) up to -0.50mm.
As you can see from this picture it seems to me that the right quote is around -0.70mm:
Here a picture of four samples out from the printing bed ( just to have a better view):
It seems strange to me that the PLA flow is not constant and I don't know if this is a problem and if it can reduce the adhesion.
I have tried to print the part by using Flex material (Flexfill 98A): the result is ok!
I have used some glue and the filament stick well to the printing bed.
But I need to print this part with PLA because Flexfill is too soft.
I'm sure I'm making mistake somewhere but I don't know how to fix this problem!
Thanks in advance for any tip and advice!
Matteo
Re: Thin and large PLA plate printing problem
Sorry but there's a double picture... 🙄
Re: Thin and large PLA plate printing problem
To my eye, all the photos show a live-Z that's too high, even the -0.90 one. I'd keep making the live-Z lower.
There shouldn't be large gaps visible between the filament lines. They should be fused together in something close to a single sheet of plastic.
Re: Thin and large PLA plate printing problem
Thanks Peter! You are right: I was still to high and the filaments didn't glue at all even if I was able to print other parts whith a different shape.
I took a picture of all the others samples I've made so maybe can be useful for someone else.
Here the first 6 samples I've made: I decrease the Z quote just 0.01mm per time:
Here the second set of samples:
Here the last set: I've choosed -0.355mm and now I've started a trial print:
The last sample on the right is the one I've choosed: the filaments are glued together and you cannot see through it !
Matteo