How Much Filament Do You Waste Per Spool? (And How to Fix It)
Introduction
Most people focus on:
- print quality
- speed
- settings
But there’s one thing almost nobody tracks:
👉 how much filament is actually wasted
And the answer might surprise you.
The Hidden Waste in Every Spool
Every spool of filament has one thing in common:
👉 it never gets used 100%
At the end of the spool, there’s always a leftover piece that:
- is too short to use
- can’t be reliably printed
- gets thrown away
How Much Is That, Really?
Let’s look at realistic numbers.
On average:
👉 50g – 100g per spool is wasted
Depending on:
- your prints
- your risk tolerance
- your workflow
What That Means Over Time
Let’s do the math.
Example: Hobby User
- 1 spool per week
- ~75g waste per spool
👉 ~3.9 kg wasted per year
Example: Small Print Farm
- 10 spools per week
- ~75g waste per spool
👉 ~39 kg wasted per year
Example: Larger Operation
- 50 spools per week
👉 nearly 200 kg of wasted filament per year
And That’s Just the Material
Now add the cost:
- PLA: ~20€/kg
- TPU: often much higher
👉 That’s hundreds to thousands lost every year
Why This Happens
It’s not because people want to waste filament.
It’s because:
👉 the last part of a spool is hard to use
The Core Problem
You can’t reliably:
- start a print with very short filament
- predict if it will run out
- risk a failed print
👉 So most people don’t even try
Common “Solutions”
People try things like:
- manually swapping filament mid-print
- monitoring prints closely
- estimating usage
👉 But let’s be honest:
- it’s inconvenient
- it’s unreliable
- it doesn’t scale
The Smarter Approach
Instead of trying to use leftovers individually:
👉 combine them into usable filament
Why Filament Splicing Makes Sense
By connecting filament pieces, you can:
- create longer usable segments
- reduce waste significantly
- use almost the entire spool
👉 This turns “waste” into usable material
What Most People Get Wrong
They think:
👉 “It’s just a small amount”
But over time:
👉 it adds up massively
The Real Benefit
This is not just about saving filament.
It’s about:
- improving efficiency
- reducing cost
- making your workflow smarter
A Practical Solution
This is where a dedicated tool like the Endless Splicer comes in.
Instead of:
- throwing away leftovers
- manually trying to reuse them
👉 you can connect them quickly and reliably
What This Enables
- use almost every meter of filament
- reduce waste drastically
- create longer continuous filament
Especially Valuable for Print Farms
For print farms, this is huge.
Because:
- waste scales with volume
- savings scale with volume
👉 Small improvements = big impact
When Splicing Is Not Enough
When Filament Splicing Reaches Its Limits
Filament splicing is a powerful way to reduce waste.
But in high-throughput environments, another challenge appears:
👉 time and workflow efficiency
In a print farm, operators often don’t have the time to:
- collect leftovers
- prepare filament
- splice multiple pieces manually
👉 Even if it saves material, it can cost time.
The Print Farm Perspective
Why Print Farms Think Differently
For print farms, the goal is not just saving filament.
It’s about:
- minimizing downtime
- reducing manual work
- keeping machines running 24/7
👉 Every interruption matters.
The Real Question
Instead of asking:
👉 “How do we reuse leftovers?”
Print farms ask:
👉 “How do we avoid leftovers entirely?”
A More Automated Approach
Using Every Gram – Automatically
This is where a different type of system becomes more effective.
Instead of manually combining filament:
👉 the Endless Printer uses each spool completely — automatically.
How It Works in Practice
- the printer uses a spool until the very last usable filament
- once it runs out → the system switches to the next spool
- printing continues without interruption
👉 No manual intervention needed
Why This Matters
This approach eliminates:
- leftover pieces
- manual splicing
- interruptions during production
👉 And ensures maximum material usage without extra work
Splicer vs Automation (Clear Positioning)
Endless Splicer vs Endless Printer – What Makes More Sense?
Both approaches aim to solve the same problem:
👉 filament waste
But they do it differently.
Endless Splicer
Best for:
- hobby users
- small setups
- occasional printing
Advantages:
- lower cost
- simple to use
- great for reducing waste manually
Endless Printer
Best for:
- print farms
- high-volume production
- automated workflows
Advantages:
- no manual work
- continuous printing
- full spool utilization automatically
The Key Difference
👉 Splicing = manual optimization
👉 Automation = system-level efficiency
Choosing the Right Approach
Which Solution Is Right for You?
It depends on how you use your printer.
Choose a Filament Splicer if you:
- print occasionally
- want a low-cost solution
- don’t mind a bit of manual work
Choose an Automated System if you:
- run long or frequent prints
- want zero interruptions
- operate a print farm
- value time over manual optimization
👉 In many cases, both solutions can even complement each other.
Final Thoughts
Filament waste is one of the most overlooked inefficiencies in 3D printing.
Not because it’s invisible.
👉 But because it happens slowly.
👉 Want to stop wasting filament?
If you want to make better use of every spool:
👉 Check out the Endless Splicer here:
https://wiesag.com/products/endless-splicer
👉 Check out the Endless Printer here:
https://wiesag.com/products/endless-printer
