JUSTMAKER Matte PLA+ 3D Printer Filament - Premium 1.75mm 1kg Black Filament with Upgrade Cardboard Spool (±0.03mm Accuracy) for Smooth 3D Printing - Perfect for Cosplay Props, Home Decor & DIY Projects

First attempt on my first print. The stuff looks like sand blasted metal. I LOVE this material it's ridiculously strong and sharp looking (I got the ash gray)I tried printing this at least 10 times with various settings. The roll I got is either bad, or it's just not good filament. It stuck to the bed great, so no issue there, but there were constant tiny gaps in my prints and the layer adhesion was terrible, all but two things I printed were very weak and not sturdy at all, regardless of the infill. I think this filament would look fantastic if you are able to get it to print well but I would only use it for decorative items that don't get used physically.Poor layer adhesion and overall strength. This is not PLA+ or even flat PLA. Whatever additive they are using is the same as the free spools you get with cheap printers. Bulk recycled and filler material added PLA. This is not worth 9$ a roll as test filament. Brittle and extremely weak. Will be returning and going with another brand.First off, let me say that the pictures of the prints made with this filament do not do it justice. The pictures show flaws that generally are not visible when you are holding it and looking at it yourself. Even so, I suspect any remaining defects can be worked out through more tweaking of the print settings.This filament came very well vacuum sealed and wound cleanly. Additionally, it comes on the best of the cardboard reels that I have yet seen. They are a bit thicker than the others I have seen and they were not flexed on the edges from the sealing. When I looked at it, I immediately noticed that the filament itself appeared very unusual looking...almost rough textured. And, when I felt it, it actually does have a bit of a rough texture. This texture is even visible in the picture. I have never seen any other filament quite like this before.For a quick print test, I did a Benchy at 210C, 35C bed temperature, 50mm/s. While the print quality was not bad, I did notice a bit of under extrusion and the layer adhesion was a bit weak (as evidenced by what happened to the smoke stack while I was removing it from the print bed). Even so, I was immediately struck by the finish of the print -- I have never seen any prints that looked this much like, well, clay or pottery. There are next to no visible layer lines and it has the most truly matte finish I have ever seen on anything 3D printed. The prints even feel more like pottery than they do something printed. It is really difficult to describe.As far as bed adhesion goes, this stuff sticks to a nearly unheated glass/gluestick bed as well as any I have tested -- almost too well, as the first Benchy was witness to.By this point, I had also taken several sample measurements of the filament diameter and found it to range from 1.72mm-1.74mm everywhere I checked, with 1.72-1.73mm being the most common, which is within specification.My next tests I did at 220C and the increased the flow to 101% to help account for the slightly reduced filament size. The print quality and strength improved tremendously. The Benchy still had a few blobs here and there and also a few areas that look like under extrusion from filament leaking during travel moves, but nothing too major. I expect that with a bit more tweaking, I can probably get the print nearly perfect.I also printed out a 40mm calibration cube at the same settings, and it came out great -- especially dimensionally: 40.06x39.98x40.01! Even on a well tweaked printer, that degree of accuracy is almost unheard of. Once again, the print bonded to the bed ridiculously well at 35C with no warping or separating. I actually ended up heating the bed to 60C in order to get the cube to loosen up enough to remove it.The only reason I am not giving this filament 5 stars is because it does seem a bit temperamental to get a really good surface quality out of and I suspect it may require quite a bit more experimentation until I get it exactly how I want it. That said, I think the matte clay-like finish on this filament makes it worth the effort involved.Personally, this is just one of the coolest looking and feeling filaments I have ever worked with!First off I have to say that the print qualities of this filament are outstanding. I printed with a 210 degree nozzle and a 60 degree bed temp. I use a PEI sheet and lower bed temps don't provide proper adhesion. I also used a 60mm/sec print speed. Flow was really good and there was very little stringing, except of the initial raft layer. This problem is actually not a problem at all on my Biqu printer, but on my Enders it is for some reason.The model quality was really quite good. I don't print with the highest quality settings as I'm mostly just printing gaming and scenery models at this point. However, my initial model came out really well. The detail was really pretty good.The only reason for the 4 star review is the color. I actually don't mind the greyish color of this blue, but it is listed as navy blue and it's too grey. For my purposes, the blue/grey shade works just fine, but the listing did say navy blue. One other thing to note, when Justmaker says matte, they mean matte. When I paint my models, matte is so much better than some of the shiny filaments and some filaments listed as matte are not really matte. This one is.It's a really good filament, but perhaps the person who's classifying the colors shouldn't be partially color blind.