The Great Empty Spool Problem: What 3D Printing People Actually Do With Them
If you own a 3D printer long enough, eventually you end up staring at a growing tower of empty filament spools wondering how this became your life.
It usually starts with good intentions.
“I’ll reuse them.”
“I’ll buy refills.”
“These might come in handy.”
Six months later you have a plastic spool mountain threatening structural integrity in the corner of the workshop.
A recent community discussion turned into a surprisingly entertaining look at what people actually do with empty spools — and the answers ranged from wholesome to mildly unhinged.
The Most Common Answer: “Just Buy Refills”
A shocking number of people responded with some variation of:
“Buy refills.”
Apparently this is what responsible adults do.
Some users mentioned that refill prices have finally started becoming cheaper than full spools in certain regions, especially for common colours like black and white. Others pointed out the opposite problem — that refill pricing still makes absolutely no sense compared to buying a fresh spool outright.
Which explains why many of us still have enough empty spools to build defensive fortifications.
The Workshop Storage Rabbit Hole
This was by far the biggest category.
People are using empty spools for:
- Extension cord storage
- Christmas light winding
- Rope and paracord management
- Cable organisation
- Ribbon storage
- Wire spools
- Hose holders
- Rivet and bolt drawers
- Craft storage systems
Once you see it, it’s hard to unsee: filament spools are basically just tiny industrial cable reels pretending to be packaging.
Several makers mentioned mounting them directly to garage walls as cord holders, while others print modular drawer systems that clip into the spool core itself.
At some point the spool stops being trash and becomes infrastructure.
The Unexpectedly Wholesome Category
One of the more popular ideas was turning spools into cat toys and donating them to animal shelters.
Apparently cats absolutely love them.
Others donate them to:
- Schools
- Kindergarten classes
- Arts and crafts groups
- Science teachers
Teachers reportedly use them for:
- Building projects
- Demonstrating balance and motion
- Pulley systems
- STEM experiments
- General “keep children occupied for 20 minutes” engineering
Honestly, this might be the most noble fate a filament spool can hope for.
The “Marketplace Economy” Exists Somehow
A surprising number of people are actually buying and selling used spools online.
Prices mentioned ranged from:
- $2–$5 per spool
- Free pickups
- Bulk giveaways
This mainly seems driven by people who accidentally bought refill-only filament and suddenly realised they had nowhere to mount it.
Which is a very specific form of modern suffering.
The DIY Engineering Crowd
Naturally, some people looked at an empty spool and thought:
“What if this became a machine?”
Community projects included:
- Turntables for spray painting
- RC car wheels
- Stackable storage towers
- Drawer systems
- Filament rewinders
- Future recycled filament stock
- Light fixtures
- Cable reels
- Animal enrichment devices
One user even mentioned saving theirs for recycled filament production with a filament extruder setup.
That’s the full lifecycle right there:
plastic → filament → print → empty spool → shredded plastic → filament again.
The circle of nerd.
The Chaos Alignment Responses
Not everybody approached the question constructively.
A smaller but very vocal group suggested:
- Throwing them in the trash
- Burning them
- Using them for skeet shooting
- “Returning them to the ocean” alongside car batteries
The internet remains undefeated.
The Real Answer
The truth is empty filament spools sit in a weird space between:
- “Definitely useful”
- “Definitely clutter”
Every maker believes they’ll eventually need them.
And to be fair… sometimes they do.
The moment you need to organise extension cords, rewind tangled filament, store Christmas lights, or build a quick workshop jig, suddenly that pile of “junk” becomes surprisingly valuable.
Until then, they’ll continue sitting in the corner silently multiplying like plastic rabbits.
And deep down, every 3D printing hobbyist knows the real reason we keep them:
Because the second we throw them out, we’ll need one.