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If you're following this link, you've received Protopasta Bronze in Maker Box. Bronze is 1 of 5 Protopasta metals and 1 of 3 that can be both polished and oxidized. Which finish will you choose? See all of our metals here.


The recommended methods for polishing and oxidizing have evolved over the years. Here are my current polishing and oxidizing recommendations:

I prefer polishing with 3M polishing paper. You can first sand away layer lines with locally available 1XX-2XX sand paper before moving on to the kit's 400-grit. I recommend stopping shy of 8000-grit. I find that 6000-grit gives peak polish. Each time I switch grits, I sand/polish perpendicular to the previous grit to make sure the previous sanding/polishing marks are removed before moving on to the next grit.

I oxidize with a mixture of 3 T water, 1 T white vinegar, and 1 tsp salt. I first expose the metal with sandpaper or a wire brush. You can also oxidize a part at any point in the polishing process. Building patina, much like polishing, takes patience. To oxidize, wet the surface, let dry, and repeat. Using a spray bottle to mist water helps avoid drips to build oxidation without also washing it away.

Want to try your hand at replicating our work? Print yourself an icosa or something else from our Thingiverse page. For some extra fun, mash up polishing and oxidizing or add some paint with strategically exposed metal for a unique weathered look.

Whatever your technique, we hope you enjoy making valuable, cherished prints for yourself and your family, friends, or business. With some many pastabilities, your only limit is creativity. Don't forget to share your beautiful creations with the world!

Protopasta Metals are made with real metal powder but print similar to standard PLA (for extended use select a wear resistant nozzle). We're here to support any printing challenges and help get you to a good result! Here are some parameters that balance of quality, speed, and reliability to get you started:

Machine(s): Prusa MK2/3, Creality Ender 3
Nozzle: 0.4 mm standard brass w/ sock
Nozzle Temp: 205 C      Bed Temp: 60 C      Bed Type: Glass, PEI, BuildTak, or other
Bed Prep: Clean w/ water or alcohol; Magigoo for additional adhesion + easy release when cool

Outlines: 3      Top/Bot layers: 6     Infill type: Lines     Infill: 25%    
Overlaps: 0     Min layer time: 0     Min Speed: 0          Fill gaps: no     Expansion: 0

Layer height Ext width Speed Fan
 1st Layer 0.32mm 0.44mm 15mm/s 0%
Rest of print 0.16mm 0.44mm 30mm/s 40-60%


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