We have a lot of Pyrex and Anchor glass containers at home, and over time, the original lids tend to disintegrate. This project started as a design challenge—not a food safety solution—but a way to explore multi-material 3D printing and solve a problem.

I reverse-engineered the lids for the containers that needed replacements. My first attempt was printing entirely in TPU. The fit was perfect, but the lid was too flexible—it couldn’t support any weight if you tried to stack another container on top. Plus, TPU is notoriously difficult to remove from the build plate.

The breakthrough came by printing the first 1 mm in PETG. PETG adheres well to TPU, and this approach solved both the removal issue and the structural weakness. The result: a lid with a stiff top and flexible sides that snaps on securely and can handle stacking.

I tried two combos:

• PETG + TPU 95A HF
  The most robust option. PETG provides rigidity, TPU seals tightly. Requires a manual filament change at layer 6.
• PETG + TPU for AMS
  The most convenient option for AMS users. Automatic filament swap. Slightly stiffer TPU and less reliable sealing, but still functional.

More information on how to successfully print the lids are included in this video:
https://youtu.be/oad6uYIr7gQ

If you want to test, try these print profiles:


3dprinting  pyrex anchor kitchen