Hackaday Podcast

Ep 362: Compression Molding, IPv4x, and Wired Headphones

Mar 20, 2026
They talk about DIY compression molding with 3D printed molds and recycled plastic. A quirky air-hockey robot build and a relay-based balanced ternary adder get highlighted. There is an alternate-history IPv4 extension and a modern revival of an old brick cellphone with 5G guts. The conversation also covers zipper repairs you can print and a debate over wired versus Bluetooth headphones.
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INSIGHT

Simple Compression Molding With 3D Printed Molds

  • Compression molding recycled plastic with 3D-printed molds lets hobbyists make parts without industrial injection tooling.
  • Jenny explains melting milk jug tops in a toaster oven, pressing into PLA/PHA molds with mold release and hand pressure for small runs.
INSIGHT

3D Printed Molds Help Manual Plastic Molding

  • 3D-printed molds can be advantageous because they slow heat loss, keeping molten hobby-molded plastic pliable longer for manual pressing.
  • Elliot and Jenny note printing molds in materials that either stick or don't stick to the feedstock lets you choose release behavior.
INSIGHT

IPv4X Proposal Keeps Backward Compatibility

  • Bill PG's alternative history proposes IPv4X: keep 32-bit IPv4 and add a flag to extend addresses with 96 extra bits for backward compatibility.
  • Elliot says IPv4X would avoid mass NAT and ease direct addressing by giving households large subaddress spaces while preserving legacy hardware.
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