Two Part Bed Adhesion
Hello,
I'm just getting into 3D printing and having a terrible time getting these to print. I've tried rotating them in different ways and putting a skirt around them (which is really difficult to remove) to no avail, sadly.
I can print each part separately, but I was trying to do the entire case at once. I'm using all the default settings and not really sure where to start making adjustments.
I've attached my project as well as my models, any help would be greatly appreciated.
Kindest regards.
RE: Two Part Bed Adhesion
First of all, thanks for including the 3mf file!
The usual suspect: a steel sheet not properly cleaned. Give it a good scrub with dish washing soap and lots of hot water, and after drying wipe it with 90+% isopropyl alcohol.
Looking at the 3mf file, the print profile doesn't look like default, when compared to the Mk4IS 0.4 profiles I see in Prusaslicer. In particular, the layer height caught my eye, 0.35 mm first layer for a 0.4mm nozzle is high. Also, why in the world would you use Star infill ? Not that I think it matters much for this particular model but still.
If I set the print profile to 0.2mm Structural, 15% Cubic infill, and 4 perimeters (to get rid of the small amounts of infill in the side walls), I cut more than an hour from the print time, and feel more comfortable getting good adhesion. See attached
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: Two Part Bed Adhesion
I concur with FoxRun3D. A layer heigh of 0.35mm isn’t the best choice for 0.4mm nozzles. Also, I haven’t tried Elegoo PLA, but 230-220C nozzle temps are probably too high, My normal settings are 210C first layer and 200-205 the rest. That’s for all my printers and every PLA brand I print usually. If you have warping issues with the larger part, maybe raising bed temp. to 70C would help.
Another odd thing in your settings are the speeds. Even with a 0.35mm. layer height they seem too slow overall and, above all, very uneven. You said you used a standard profile ?. 60mm/s for bridges and only 20mm/s for solid infill isn’t standard at all. Default values for the structural profile are 50mm/s bridges and 140mm/s solid infill.
RE: Two Part Bed Adhesion
I keep seeing people suggesting raising bed temperature to high levels for PLA prints that don't stick. That actually makes things worse for me. PLA filaments have a VICAT temp in the region of 60 degC usually, going above that on your bed means the plastic never solidifies and for me at least reduces adhesion. Max I use with PLA is 55 DegC.
More effective in my opinion is to reduce the part fan cooling speeds. Printer fans have in general gotten more effective over time and you can get the same amount of cooling at lower speeds that we used to have to use 100% for on an older MK3. For example on my SV08 it actually has 2 fans and the cooling is several times better than my old MK3. I've got that running between 30-50% for PLA with it upping to 70% for bridges.
Long straight lines warp more which is why boxes have more difficultly, but cooling too much will exaggerate the contraction and will lead to more warping.
Naturally I 100% agree about bed cleanliness. Its is paramount to get it properly grease/oil free for maximum adhesion.
RE: Two Part Bed Adhesion
Yes, I inadvertently uploaded the project after I started trying to naively get myself out of the adhesion issues, I've been running into, my apologies for that. Thanks to everyone's suggestions I've made great strides. Even though there is one slight issue remaining, prints have never come off this printer so nice, thank you so much.
I started by using the project file uploaded by @foxrun3d, the initial print had all the corners raising off the bed at around 30-40% print completion. I then changed the settings suggested by, @artur5. Making the first layer nozzle temp to 210C and all subsequent layers to 205C. I also increased the bed temperature to 60C.
These combined changes produced a beautifully adhered print and it's just beautiful!
I do have one last issue, for some reason, on the bottom piece (left item), the back and left sides, seems like it's "tearing". And during printing, is sounds like the nozzle is actually scraping on the part, very unnerving, especially with the correct speeds. Is there anything in my part design that might be causing the issue? Maybe the radius on the bottom of the part? Strange thing is, the top piece (right item) printed beautifully, no issues at all. I've attached pictures of the issue I'm encountering; any insight would be greatly appreciated.
Kindest regards.
