3D printable 3 axis + Open Source compact and long range using standard M3 hex 60mm and 40mm screws and nuts. Mounting possibilities on standard Metric and Imperial style breadboards with M6 and M3 screws, most common lab-ware, or with magnets or clamps. Featuring anti-backlash double nuts with thin soft washer in between. The smart, inexpensive, omni-compatible choice for most lab needs. Difference between V1 and V2 is the shape of the rails: V1 has |_|-shaped rails ; V2 has V-shaped rails... You choose. Knob goes for both Versions and you need 4 of them. Parts are already positioned in the optimal orientation for printing. For better results, print as many as you can fit on your bed, this will give the plastic time to cool before the next pass of the nozzle, also use a fan if you can. Slice as thin as possible and print slowly, it's compact and precision is more critical here than print time... you can save time on non-print moves. Please provide feedback and bring improvements on tolerances and printability. Download the SketchUp model to figgure out how to assemble, it's easy. you need to glue some parts together, they are separated for better printability. You also need to glue the knobs and the lone sockets on the screws: tighten the lone sockets just right and glue them onto the screw. glue the double sockets inside their holes. If you don't have SketchUp you can view the model here https://3dwarehouse.sketchup.com/model.html?id=u741cce04-f44d-4dd2-93b7-8a16d74b671a but I strongly suggest you learn SketchUp, it's the best :) Hey, if you like this kind of stuff you would probably like to collaborate here http://www.sensorica.co/home/what-we-do/projects/pv-characterization and claim some revenue and equity, take a peek :) Cheers!