As the sun goes down on a glorious spring evening on the western edge of Europe, Elliot Williams is joined by Jenny List for a look at the week in all things Hackaday.First up: Hackaday Europe tickets are on sale! Bad luck folks, the early bird tickets disappeared in an instant, but regular ones are still available for now. We’re really looking forward to making our way to Lecco for a weekend of hacks, and it would be great to see you there too.Then we have a new feature for the podcast, the Hackaday Mailbag. This week’s contribution comes from [Kenny], a longtime friend of Hackaday and probably our most regular conference attendee.To the hacks, and we have some good ones. An air hockey robot might not seem like a challenge, but the engineering which went into [BasementBuilds’] one proves it’s not a job for the faint hearted. Then we look at compression molding of recycled plastic using 3D-printed molds, something that seems surprisingly accessible and we’d like to try, too. We’ve got a new DOS, a 3D-printed zipper repair, the IPv4 replacement we didn’t get, and the mind-bending logic of ternary computing. It’s one of those weeks where the quick hacks could all deserve their own in-depth look, but perhaps the stand-outs are and Arduino style compiler that includes the source code compressed within the binary, and a beautifully-done revival of a 1980s brick cellphone as a modern 5G unit.Finally in the longer reads we’ve got an examination of wired versus Bluetooth headphones — we’re both in the wired camp — and a look back at the age of free dialup. As is so often the case, the experience there differed between Brits and Americans. Anyway, enjoy the episode, and we have another week to look forward to.Download your own personal copy of the Podcast in glorious 192 kB MP3.Where to Follow Hackaday PodcastPlaces to follow Hackaday podcasts:iTunesSpotifyStitcherRSSYouTubeCheckout our Libsyn landing pageNews:Hackaday Europe Tickets Go On Sale, CFP ExtendedWhat’s that Sound?Congrats to [Captain Click-Clack] who got it wrong, but just as right as anyone else.NASA’s Sounds From BeyondInteresting Hacks of the Week:Building A Robot Partner To Play Air Hockey WithRecycled Plastic Compression Molding With 3D-Printed MoldsPrinting With PHA Filament As Potential Alternative To PLAThe IPV4 We Didn’t GetDR-DOS Is Back, But Not Quite As We Knew ItRelays Run This Balanced Ternary AdderThis Printed Zipper Repair Requires No UnsewingQuick Hacks:Elliot’s Picks:Mapping The Sound Field Of An Acoustic LevitatorTesting Whether Heated Chambers Help Brittle FilamentsForgetfulino Puts Back Up Of Source Inside The BinaryATtiny85 Plays The Chrome Dinosaur GameJenny’s Picks:Off-Grid Electricity And Hot Water From Scrap WoodA Voltage Regulator Before ElectronicsZip-Drive Emulator Puts Big Disks Back On LPTNo More Paperweight: This Vintage Brick Phone Is Back OnlineCan’t-Miss Articles:Ask Hackaday: Wired Or Wireless Headphones?The Rise And Fall Of Free Dial Up Internet