Proto-pasta Composite Brass HTPLA, 2.85mm 500g

I printed this using slower PLA settings at 205c on an Ender 3 with no issues. When polished the filament looks like copper as advertised. Parts come out looking like terracotta at first and have a similar feel and density to them. Printed parts have a very nice feel. The filament is substantially weaker than regular PLA and should not be used for structural parts. Because the filament is fairly brittle you should use a filament guide or keep the filament from having to take any sharp turns.

Bottom line: $50 for 90m is steeepDefinitely adjust the material weight for this filament so you don't run out of the spool: 2.3 g/cc is heavy which means that 500g only gets you around 90m of filament in a spool.With some sanding and post processing, this really does shine like copper which is super cool for a 3D printed object like a pot or figurine.At 50% more $ per g than Colorfabb, think I probably won't buy this regularly.

Disregard the shaving issue I had on the bottom layers. That has since been cured. But look at the finish I got on my first attempt here. Using suggested settings from Proto-Pasta on my CR-10 V3, this wall hook I printed out came out very strong. It looks more like terracotta when printed. Next one out I'm going to sand and patina it. My goal was to print some custom bases for my desktop sculptures.

I've used 3 spools of this filament in my Lulzbot printers for various projects. The main takeaway is that despite at least 3 other rivals selling metal-filled PLA composites containing copper, brass, bronze, etc., there simply isn't (to my knowledge) another competitor offering a readily-available iron powder blended PLA. Luckily, Proto-Pasta's magnetic iron PLA is pretty good.In my experience, printing with it may be anywhere from easy to impossible depending on various factors. For me, PLA heat creep has been an issue with all Proto-Pasta's high-temp PLA filaments, but the iron-blend is the worst. I have a print toolhead that is actually incapable of printing this filament past a few layers, and another that will happily print with it flawlessly using default settings. I got a third toolhead working by lowing retraction settings to nearly nothing, and by counter-intuitively INCREASING the hot end extrusion temp!Once printed, it looks very good. It bridges well, does not string much, hides layer lines a bit, and has a nice matte texture.Strong magnets can stick to it provided you have thick walls and/or dense infill plus a reasonably strong magnet. I'm not sure what the point of this would be.Its weight and ability to rust seems to be its best qualities. Using nothing but a solution of bleach sprayed onto the printed part and leaving it for a few days can produce a very nice rust effect.Many tutorials will tell you you can enhance the qualities of parts printed with iron PLA by sanding and wire-brushing them. However, sanding does change the lightness and texture so if you do this, you're signing up to evenly and thoroughly sand every nook and crevice of the part. Since it's tough to get even sanding and brushing all over a part in some cases, I recommend trying to rust a part without sanding it to see if you like the effect. I've attached a rocket that I printed in Proto-Pasta iron PLA and did minimal post-processing and no sanding on as an example.

I ran this on an Ender 5 Pro, at 205°C nozzle, 60°C bed, with a .6mm hardened steel nozzle; all suggested settings for this stuff. The filament fed for all of 3 seconds, and then stopped for some reason. I thought maybe it needed to be re-fed, so I attempted to un-feed the filament and it required such force to try to get out that it broke off inside of my bowden tube. I now have to unclog that mess, as something clearly went wrong near the hotend. Don't buy this. For $45/500g spool, you should expect better, more durable packaging, and filament that prints consistently, and doesn't break your printer.

Prints great rusty up for cool effect but is really brittle so have to barely handle so it doesn't snap

This prints a lot like the Carbon Fiber from proto-pasta. In a 4mm nozzle it runs well at 220C and 30mm/s; much faster and the extruder doesn't keep up real well.It's a very heavy material and prints realllllyyyy easy, as long as you run it slow and hot.I'm using a Monoprice Mini

Love the look, love the weight of this filament. It comes at a price, i'm ok with it. But IDK if its all rolls or just bad luck on mine. But this roll came with way too many tangles. I got this today and printing a larger print where I've had to stop the print 3 times and counting because of how the roll is tangled.