If you've got a 3D printer, you've got a stash of plastic junk. Failed prints, supports, test pieces — they add up fast. So what do you do with all that PLA waste?
[future things] on YouTube has a cool answer: compression molding. In a follow-up video, they showed how to turn shredded PLA waste into actual useful objects — like game tokens for their kid. And the molds? Also 3D printed with PHA-based filament.
How It Works
The process is straightforward:
- Heat PLA to around 130°C until it reaches the consistency of thick honey (takes about 5-7 min)
- Press into a 3-piece 3D printed mold
- Wait 30 seconds — then pop it out
No fancy equipment needed. A toaster oven works. Some use a ratcheting clamp for extra pressure.
What's Compatible
- PLA — easiest, no surprise
- HDPE — works fine at slightly higher temps
- PETG — great with PETG molds, per commenters
The molds themselves are PHA-based and hold up well. Mold release spray is also fine to use.
Why This Matters
You're not just throwing plastic away — you're closing the loop. That failed print becomes a game token, a small part, a custom shape. No expensive recycling machine required. Just heat, press, done.
This is the kind of project that makes your printer a little more sustainable.
Source: Hackaday (2026-04-28)
