Calibrate a 3D printer and send print alerts to a phone and Home Assistant

The poster, u/RamboAssassin, connected their 3D printer to their computer over USB and worked with Claude Code to improve it. The agent ran bed leveling checks and built a small tool that shows which side of the bed is off. Without being asked, it designed and printed its own test models: a temperature tower with each temperature printed on its block, a stringing test and a flow test. It then wrote the best settings into Orca Slicer. It also set up a dashboard that streams print progress to the poster's phone and to Home Assistant, sends ntfy notifications when a print starts and ends, and keeps a history log of prints with temperatures and stats.

The leveling tests showed the bed warps a little when it heats up, which explained first layers failing on one side. The stringing test showed the filament was wet. The poster no longer walks down to the basement to check on prints. No numbers on print quality or time spent are given.

A commenter, u/Bloated_Plaid, runs a bigger version on five printers: Haiku watches camera frames and escalates to Sonnet, which decides whether to alert and can pause or cancel a print if nobody responds. Neither poster shared code, though several commenters asked.