How to recycle failed 3D prints

Can failed 3D prints be recycled?

Yes, if they're PLA or PETG and kept separate by material. Thermoplastic filament can be shredded, dried and extruded into new filament. What stops most failed prints being recycled isn't the plastic, it's that they end up mixed with other materials or thrown in the garbage.

Step 1: make less waste

The cheapest scrap is the scrap you never print. A few habits cut waste a lot:

• Calibrate first layer height and bed levelling before long jobs.
• Dry hygroscopic filament like PETG before printing, since wet filament fails more often.
• Use tree or organic supports where your slicer offers them, and orient parts to need fewer supports.
• Print a small test piece before committing a full plate.

Step 2: sort by material as you go

Keep one container for PLA and one for PETG next to the printers. Different plastics melt at different temperatures and don't blend into filament that prints well, so a mixed pile usually can't be recycled at all. Label the containers and sort at the moment you pull a print off the bed, when you still know what it is.

Keep out anything that isn't plain thermoplastic: resin prints, parts with metal inserts or magnets, and plastics you can't identify.

Step 3: reuse what you can

Some failed prints still have a use: as test pieces for tuning, as jigs or spacers, or for teaching. Long leftover filament ends can be used for small prints. What's left after that is ready for recycling.

Step 4: send it to be recycled

Don't put 3D prints in the blue bin. Municipal recycling is set up for packaging, and prints are usually sorted out as garbage. Instead, choose one of these:

• Local pickup. A service collects sorted scrap from your shop or school. This suits businesses and schools that make scrap every week.
• Mail-in programs. You ship sorted scrap to a recycler. This works anywhere, but shipping costs add up for heavy bins.
• A home or shop recycler. A shredder and filament extruder lets you make your own filament. It takes space, time and tuning.

Our guide to 3D print recycling options in Canada compares these in more detail.

How much filament do you get back?

Some plastic is always lost: dust and fines from shredding, moisture driven off in drying, and purge at the start of each extrusion run. In practice, 1 kg of failed prints, supports and purge makes about 0.7 to 0.8 kg of recycled filament.