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Support development – unlock supporter rewards
Every contribution matters. Even smaller support levels receive supporter recognition, while higher tiers unlock a coupon redeemable on the first RFF product.
Did you support us on 4fund?
If you supported RFF development on 4fund, you can claim your supporter discount here. After verification, we will send your coupon code, which can be used on your first product order.
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Send these details by email 4fund name, contribution amount, contribution date, email address, and order email if different.
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Attach proof A confirmation email or screenshot helps us verify your support clearly.
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We send your coupon code After approval, you will receive your unique code.
Claim your discount by email
If you use Gmail, choose the Gmail button for the most reliable experience. For other mail apps, use the default email application button.
The email template is pre-filled. You only need to add your details and attach the confirmation.
The coupon can be used on the first RFF product.
Not just a concept — the system is already working on a real filament path.
This image shows the full operating logic: the spool can stay farther away, the RFF takes over the mechanical burden of the long path, and the printer extruder receives a controlled, stable filament section.
The problem is not the filament — it is forcing the extruder to handle the entire path.
When the spool or dryer sits far from the printer, the extruder is no longer just feeding material — it must also overcome friction, bends, and rolling resistance. That is exactly the kind of load most lightweight printhead extruders were never optimized to handle.
1The spool is no longer near the machine
When filament comes from a dryer, remote holder, or enclosed cabinet, a long loss-heavy section is already created before it even reaches the printer.
2The extruder is not only feeding — it is fighting
Lightweight direct drive and Bowden systems were built primarily for precise material delivery, not for handling the full resistance of several meters of path on their own.
3The failure is not always immediate — just expensive
The issue often shows up hours later: unstable retracts, ground filament, unreliable pull-in, under-extruded layers, or a completely failed print.
Current prototype
Development details
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