Tevo Tarantula Circuit Board Scribe V2

thingiverse

See V1 for a video on how to use this attachment: https://www.thingiverse.com/thing:2882238. V2 is stronger, thinner, lighter, and improved in many ways. This version sits closer to the mounting screws, reducing leverage on the X carriage. The last version used V-groove bearings which were not ideal due to too much play. My brother pointed out that linear bearings are available in smaller sizes, allowing this tighter design. The dual LM3UU bearings specified in this version provide a much closer tolerance on the scriber shaft, enabling more accurate traces and pads. Even the smallest surface mount parts can be used on boards created with this scribe. The mounting holes have been changed to slots and doubled for greater rigidity. The Backplane.stl of this version is backwardly compatible with the original version Rear_Mount_Block.stl, but it should be replaced with the new version for better tolerances and more mounting points, better positioned. This design is very forgiving of print errors, as long as the channels for spring, scribe shaft, and linear bearings are free from flashing, blobs, hairs, etc.