Endless PETG #1 (March 2022) - High Five Blue and Carbon Fiber PETG

What do Milk Duds and Protopasta PETG have in common? A high five to anyone who guessed it! We hope you enjoy Joel’s favorite sweet treat, Milk Duds, while printing with High Five Blue PETG. What’s not to love about this blue though, really? Do you remember when we first designed it together with Joel? What a special experience!

It’s funny how things come full circle. Joel’s back on Etsy (be sure to check out his store), and we’re back to more High Five Blue (and Carbon Fiber too, but more on that in a bit). We’re grateful to Joel for all he’s shared, inspired, and encouraged over the years. If not for him, not only would High Five Blue not exist, but you might not know about us. Thank you Joel and good luck as you expand to platforms like TikTok (be sure to follow @joeltelling5).

Joel has been a fantastic ambassador on behalf of the Protopasta and the greater 3D printing community. We all owe him a lot for his integrity, positivity, and dedication. He may be the hardest working individual in 3D printing. I say that, but there are so many fantastic hard working makers and creators. We appreciate you all!

In fact, there is nothing more rewarding than supporting other makers, especially those that, like us, made the leap to a business based on 3D printing. It can be intimidating to have other businesses rely on you, but being there for another business to support their product with our own… well, it really doesn’t get more rewarding!

This is exactly what happened in the case of Carbon Fiber PETG. In these constrained times, we’ve actually been working on supply and formulation of PETG for basically the entire pandemic. We weren’t ready to commit to release with these in flux, but behind the scenes, we found an opportunity to support Negative Supply.

We connected with Saxon McClamma of Negative Supply, who was working to replace HP Fusion Jet parts made from sintered nylon. He chose Matte Fiber HTPLA for it’s stability and strength. He loved the layer-hiding, low light reflection surface, but wanted something with a bit more flex and temperature resistance without heat treating. We shared a sample of the Carbon Fiber PETG we had in development, and he was hooked.

The amount of material Negative Supply has consumed, and in replacement of 3d printed nylon, is impressive. Even though Protopasta Carbon Fiber PETG is new, it’s been tested and proven by Negative Supply in multiple applications over the last couple years. They often use the parts as-printed, but sometimes wrap surfaces (especially top and bottom) with Tolex vinyl to further improve aesthetics. The 3D printed part’s texture and fibers help with adhesion.

Protopasta Carbon Fiber PETG has become Negative Supply’s go-to general-purpose engineering material! Why? Because it prints so easily and reliably while performing so well. And when they're done, the cardboard spools are recycled locally for reduced environmental impact, reinforcing a commitment to only put long-standing material where long-standing material is meant to be!

We’re so excited for this collaboration with Negative Supply. Thank you Saxon! For more about Negative Supply read below or visit their website, Negative.Supply. When at their website, look closely and you’ll notice 3D printed Carbon Fiber PETG in most of their products.

About Negative Supply:

Negative Supply exists to create tools for film photographers around the world that want to spend more time photographing, and less time scanning. Their first product, the Film Carrier MK1, allows digitization of negatives and positives using a digital camera and macro lens in as little as 5 minutes with readily available tools. Available now.

Using agile manufacturing techniques at their California design studio and assembly workshop, Negative Supply is able to create tools for working photographers and archivists not available elsewhere. They believe in doing everything they can in house. From hand assembly to local finishing, they work with craftsmen and craftswomen across the US to source the best quality components for creating products to last generations.

Learn more at negative.supply and shop at negative.supply/shop


We find these general parameters to work well for our prints, but don't hesitate to reach out to support@protoplant.com if you need any further guidance.

Machine(s): Prusa MK2/3, Prusa Mini, Creality Ender 3 
Nozzle: 0.4 mm nickel-plated brass (or similar) w/ sock (if possible)
Nozzle Temp: 210 - 235 C      Bed Temp: 70 - 85 C      Bed Type: PEI
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%     
0     Min layer time: 0     Min Speed: 0          Fill gaps: no     Expansion: 0

Layer height Ext width Speed Fan
 1st Layer 0.32 mm 0.44 mm 20 mm/s all over 0%
Rest of print 0.16 mm 0.44 mm

20 mm/s outline

40 mm/s infill


Expect similar results on all machines with layer adhesion starting at 210 C at 2-3 cu mm/s volume rate. Required temperature will increase with volume rate and higher temperatures and/or lower speeds will increase gloss.

We recommend upgrading the Prusa Mini to a Bondtech heatbreak, moving the PTFE junction farther away from the hotend to reduce hang-ups. The Prusa MK3 has the stock Prusa heatbreak with lip, but swapping to a standard e3dv6 heatbreak or e3d lite6 hotend can bring more trouble-free results. The Creality Ender 3 requires no modifications.

All can benefit from a calibrated first layer that is not too close to the build platform. Leaving enough room for material to come out without restriction, yet still close enough to stick, is key for more trouble-free printing.
Having trouble with your loose coils? We can help! Check out this awesome printable spool that only takes 50g of filament!


We know printing isn't always trouble-free so if you're looking for instructions on how to wrangle those loose coils or need other printing help, please consider our getting started guide!


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