Show HN: Kurvengefahr – browser CAD/CAM for pen plotters

A new Show HN project called Kurvengefahr is serving a very specific dream: draw shapes in your web browser and turn them into instructions for a pen plotter, basically a machine that draws for you. The page itself looks calm and practical — grid, tools, machine settings, preview — but the comment section instantly became the real show, with a mix of applause, bug reports, and one absolutely chaotic detour.

The warmest reaction came from people impressed that the tool even behaves nicely on a phone, which sounds small until you remember how many creative web apps fall apart the second they hit a tiny screen. One early commenter basically gave it the internet equivalent of a supportive nod: nice job, and wow, it actually looks decent on my handset. But of course this is the internet, so the compliments barely had time to sit down before the nitpicking arrived. Another user jumped in with a very specific complaint about the Shift key not doing what they expected while editing a curve point — exactly the kind of laser-focused feedback that says, “I like this enough to immediately break it.”

Then came the comedy. One commenter dropped a playful German pun — “Achthung die kurve :D” — while another swerved wildly off-road with a baffling line about FRAND and the Patriot Act, which felt less like feedback and more like the comments section briefly opening a portal. So yes, the tool launched, people are intrigued, someone found a flaw, someone made a meme, and someone may have posted from another dimension. Classic internet rollout.