A lot easier to print with than I first assumed. Having bought metal filled pla many years ago (different brand) and dealing with ensuing problems I stayed away from metal infused anything until now. I highly recommend it, so long as you have a hardened nozzle (I used a .8) it printed as easily as regular PLA.

Just amazing filament!!

I just completed a lamp project from @TomaszFortyFour. I used Proto-Pasta's copper, brass, bronze, iron and some regular brown metallic PLA for this. I am completely blown away at the results and quality of this filament! I printed everything on my Prusa MK4S, kept the bed temps at 60c and nozzle temps around 200c. Used .04 brass nozzle with all other settings kept standard. Project was 137 printed pieces and again, the filament printed flawlessly every time! Placing an order after this review for more. Thank you!

Great product, but prepare to put in the work.

I have purchased both the Proto-Pasta Bronze and Copper filament. I could go in for a long, rambling description, but let me just get to the point. First, these guys make some of the highest quality filament I have used. I noticed this as an afterthought as I was doing the very lengthy post processing. required to get the most out of the metal filament prints. When your print first comes out of the printer, expect it to look almost like a terra cotta clay construction rather than something made out of metal. To get the finish to resemble the stuff in their pictures be prepared to put in some work. How much work? It depends. Do you like sanding? Imagine how long it will take to sand your project. Got it? Now, multiply that by about eight times, because you start by sanding at 180 grit. Then 200 Grit. Then 400. Then 1000. Then 1500. Then 2000. Then 3000. Then 4000. Be prepared to get discouraged, because when you are up around 1500 grit, it will still look like smooth terra cotta. Then miraculously around 2000 you start seeing some twinkles. Once you get to 4000 you will start getting a better idea as to what it looks like. Ultimately, this filament give back what effort you put in. Don't feel like going through that effort? Good news, Jump straight to the patina process. If you don't need the shine, just spray it down, as recommended by ProtoPasta, and a nice patina will pop up and it looks great, with a lot less work. I have noticed that this patina wears off easily, so once you get it to where you want it, coat it with modpodge or some clear lacquer to protect the finish.

Excellent Filaments

The metal infused filaments really do look like metal after a bit of sanding/polishing (and not the brand new, polished kind, more of an old, worn kind that’s very hard to get aside from using real metal).

Prints exactly like melted cheese tastes

I was very skeptical after watching Zack Freedman’s rating of metal filled pla (no specific brand but very harsh all around) however my experience was nothing like his. This printed the easiest as anything I’ve ever printed. That being said having had a lot of battles with cf pla and cf petg, I figured this wanted similar slow speeds. I didn’t even try anything above 50mm/s. That being said it oddly seemed to like lower temps. The fan didn’t seem to change finish noticeably. I did 215 across the board, 70% fan across except 0% on first 3 layers, and 0% on ironing. I also dropped temps to 200 for ironing. I did .1 layer height (despite recommended.15 minimum) with .45 width on a .4 revo obxidian nozzle on Prusa mini. 100% rectilinear 3 perimeters and 20% overlap. Retract/detract speed of 60ms/s with .2 hop 3mm length (Prusa mini Bowden). It sands ok but not great but I haven’t annealed anything yet. Haven’t forced patina yet either.