Max Fischer publishes a full build guide for a 40-part 3D-printed CNC router

Ivan Miranda's 3D-printed CNC router circulated mainly as YouTube videos, but video is a poor medium for reproduction: viewers had to pause, squint and guess which parts, which holes and which wires. Max Fischer built the machine from scratch and then did what the format could not — published everything needed to build it again.

His GitHub repository reposted the STL and OBJ files for the 3D-printed parts, added a separate bill of materials in which every part has an item number and an image, and included the original Fusion 360 design. Then came the guide itself: photo-documented steps for drilling and tapping 900 mm aluminium profiles, mounting rails, belts and geared steppers, building electronics boxes, wiring end stops, and finally installing GRBL on an Arduino with a G-code sender.

The documentation treated first-time builders as the audience: item numbers tie every instruction to a part, and the photos cover the unglamorous steps — extending stepper-motor wires, marking cables with tape, applying cutting fluid before tapping — that usually sink a build. Fischer pointed back to Ivan Miranda's $25 blueprints and kept the files free, framing the repository as a complement rather than a copy.

The Show HN reached #2 on Hacker News on 2021-11-03 with 462 points and 140 comments; Hackaday praised the complete bill of materials, Fusion 360 files and the 'amazing' number of pictures, and Arduino's blog covered the build the same week. The repository later showed about 2,000 stars, 157 forks and 212 commits, turning one person's workshop project into a reference other builders could follow.