As popular as the designs for X-carriages with 40mm fans between the rods are, they cause a loss of x-axis travel of at least 10mm per fan. With 20mm fans like I use, this means there'll be a total of a 40mm reduction. The goal for this design is to maximize the amount of X-axis travel while still having 2 fans. This is an updated, completely redrawn version of my previous X-Carriage. Designed for use with 16mm diameter bushings. If you have linear bearings with the same OD, you could use those too. Uses zipties to secure the bushings to the carriage, since I noticed that regular designs for bushing carriages crack around the bushings. Updated 25/6/2013; Download this newer file. Added 2Fan 16mm Bushing X-Carriage 002 (repaired).stl which changes are; Increased the area where the zip ties would contact the bushings to hold them down. Lengthened the studs on the clamps slightly. Added a pair of optional clamps that would make the tensioner work. Changed the design of the fan holders back to one without the clips since they break off easily. Added a small chamfer to the fan holder to guide airflow slightly. Changes; Print out using your favourite materials and infill settings. Uses 4x 16mm bushings. Attach bushings to carriage and secure tightly using zipties. Clip off ends of zipties. Hook everything else up to the printer, print out a couple of things, maybe take a picture and let me know what you think, or what else you'd like to see in an updated version.