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Slunaz FF1R: 

Better Than a New Spool 


by SLUNAZ - Stefano Lunazzi


A Product Review 

by Joshua R. Taylor @

          Introducing The Slunaz FF1R filament joiner

          An ideal solution for seamlessly combining a selection of filament materials. While it excels with PLA, ABS, PETG, and PET-B (commonly referred to as PET1; derived from DIY home Pultrusion methods, enabling the creation of customized 3D filament from plastic bottles), its customizable settings should extend beyond these recommendations.


        The filament tolerance ranges from 1.75 to 1.76mm, accommodating most standard filament diameters. It's advisable to opt for a filament with tighter tolerances. Understanding the characteristics of your filament brand is imperative. This advice also applies to home-made PET1 filament, where maintaining a diameter below 1.75mm is essential to prevent any unit binding.

            This tighter tolerance is critical but also has its advantages. It ensures a consistent join that is uniform to the accuracy tolerance of your 3D printer's hotend. Resulting in an ultra smooth uniform join that doesn't require any extra cleaning or attention beyond what's beautifully produced by the unit itself.


            Alternative units with comparable results come at a higher price and do not offer the same level of customization as the Slunaz FF1R.


The Slunaz FF1R empowers you with the following capabilities:

  • Exact control over melt temperatures and cooling duration.

  • Varying spooling speeds to match your specific requirements.

  • Streamlined automation for continuous filament joining, needing no additional user intervention beyond loading the next filament to effortlessly create your newly reformed spool.


            In the context of PET1 Pultrusion methods, typically a 2-Liter bottle yields approximately 25 grams of filament, equivalent to about one hour of printing time.

            Most users prefer to combine these smaller quantities into larger spools; such as a 1-Kilogram spool, allowing for extended 3D printing sessions. Whether it's for an 8-hour workday, a full 8-hour night's sleep, or both. The hassle of continuously refilling the printer every hour is not desirable.


The Slunaz FF1R offers a comprehensive solution to address this issue!


            The Slunaz FF1R is particularly well-suited for making the most of leftover scraps; which are commonly generated by standard Bowden 3D printers and other multi-material methods, often leaving behind 5-10 inches of unused filament strands.


             If you find yourself regularly generating these leftovers, the Slunaz FF1R offers an excellent solution to recovering and repurposing this filament. This presents an effective means of minimizing waste and enabling you to reuse it for future prints.


            Coming from Europe; The SLUNAZ by Stefano Lunazzi, is currently running a now FULLY FUNDED Kickstarter campaign and plans to start shipping in February 2024.

            From today you can also pre-order FF1r from United States, Switzerland, Canada and UK! Shipping costs are: USA: 30 euros (approximately) and Canada 50 euros + customs duties (charged to you) of 3.1% UK: 15 euros Switzerland: 50 euros


            The SLUNAZ FF1R is offered as a DIY small parts kit, which not only saves on shipping costs but also allows customers to 3D print the components themselves. This way, they can give their Slunaz FF1R a personal touch to match their style and other 3D printer accessories.



            Within my experience in crafting 3D filament from PET1 plastic bottles through our PET1 Pultrusion units, a project dedicated to reusing aging 3D printers that would otherwise end up as waste.


            As also within the growing pultrusion community overall @ PET Pultruders United -; one of the most highly demanded requests is for an economical, user-friendly, and dependable solution to seamlessly connect our robust home made filaments.


            Requiring elevated temperatures of around 260°C and rapid cooling capabilities to prevent crystallization, The Slunaz FF1R excels in delivering precise and reliable performance with a dependable streamlined production quality.

  ,, and proudly endorse and warmly welcome the Slunaz FF1R

as our #1 preferred method for seamlessly joining filaments, catering to the uninterrupted 3D printing requirements of

our DIY PET1 filament made from recycled plastic bottles.


            As a 3D printer owner, a PET1 Pultrusion unit user, or both,

you deserve a consistently reliable method to reclaim your filament

and expand your streamlined 3D printing desires!

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