Cave Radio — Talking Through Solid Rock

From Make: magazine: Radio signals don’t pass through rock to reach caves, mines, and tunnels, right? You’d be excused for thinking so, because you’ve surely lost your favorite radio station, or your phone conversation, when you’ve driven into a tunnel. But things aren’t that simple. By using special techniques, radio communication between the surface and underground really is possible, and you can try it for yourself.

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The World’s First 4-in-1 xTool O1 Omni Printer

xTool O1 Omni Printer is the world’s first 4-in-1 desktop printer combining UV, UV DTF, DTG, and DTF. From rigid materials to custom apparel, print almost anything. Easy operation and hassle-free maintenance make it ideal for serious makers and customization businesses.

Make: Live — Inside Make: Volume 98, the Action Issue

From the Make: YouTube channel: Make: Founder Dale Dougherty and Editor-in-Chief Keith Hammond recently chatted with the authors of Make: Volume 98 about getting out of the workshop and putting rubber to the road for our Action issue! Watch the full panel now.

Review: Acmer SM 60W MOPA Split Laser

Typically when someone offers us a tool for review, it falls neatly into one of two categories – either it’s a great fit for a maker audience or it isn’t. Occasionally something comes in that isn’t immediately clear. Rarely, not often, but sometimes, it’s because it looks too overpowered for home users. That was my first impression of the 60W Acmer SM MOPA split laser.

Anouk Wipprecht Brings Delft Blue to Life and Light for the Final Dutch Grand Prix

For the fourth and final time, Royal Delft’s hand-painted trophies will stand on the podium of the Formula 1 Heineken Dutch Grand Prix, and this year’s edition carries an extra spark designed by FashionTech pioneer Anouk Wipprecht and artist-producer Don Diablo.

Romu, the RP2350 Board Small Enough to Lose

Romu is a tiny dev board by Bitmerse that’s powered by a Raspberry Pi PR2354A and runs MicroPython. And tiny it is. At just 15.5mm×12 mm, the board is barely bigger than the chip itself and fits almost entirely in a USB-A slot.

Make: Very Useful Monsters - RalfE

From the Maker Shed:

RalfE is battery-powered, no-solder, and built on micro:bit, teaching real electronics and coding as you build: lip-sync a bot, pitch-shift your voice, play theremin code, trigger Screamo mode when the lights go out, or use basic AI to wire actions to the micro:bit's onboard sensors and set RalfE up as a room sentry. The kit includes everything you need: micro:bit, Makey:bit board, servo, LEDs, 3D-printed monster parts and stand, plus video tutorials for every level, making RalfE your Really Awesome Little Friend whether you're learning or teaching.