Dual Bowden carrier with servo, and fan mount, set up to take M4 nuts for the bowden tube holder

thingiverse

I loved the original design (http://www.thingiverse.com/thing:381027), especially how easy it is to get the print heads lined up for z=0. However, I realized it didn't have any way to bolt on accessories that I plan on using - a server powered Z mount and dual cooling fans. The model needed some geometry fixing too. I'm not sure if it's anything that would break the print, but I like clean manifold geometry. Suggestions: If you prefer the servo on the right instead of the left, scale that part by 1 in the appropriate axis. Requires a vertical X-axis (like the Prusa i3) with a carrier that has 30mm spacing between mounting holes. I am planning on using http://www.thingiverse.com/thing:586636 Print heads should be spaced about 30mm on center, but calibrate carefully because there is some tolerance room built in and alignment will not guarantee it. Update: I have just uploaded "v5". I left the v4 Sketchup file but removed the STL's as I think the v5 is way better. Changes include: Changed the fan holder for 40mm fans, added in fan shrouds for cooling just the hot ends. Added an eye-balled guess at a servo horn attachment (the length may not be correct. I use a basic tact button and glue it onto the end with epoxy). Added channels in the hot end holders that should allow captured M3 nuts and bolts to hold the bowden tube holder in place. Improved the micro servo holder - now it goes all around the servo and has some support material so it is easier to print. Moved the servo further away from the hot ends to help reduce servo dancing due to electrical noise from cartridge heaters. Added support material for the hot end holder. Checked the sizes on the hot end holder and made tolerances to the j-head/groove mount standard tighter - my first print left them too loose. Cleaned up the geometry some more. Organized all the parts in the Sketchup file so they are lined up on the same Z-level and organized the parts for printing into a single STL. Update 2: I just added the -V2 series. The servo holder is closer and stronger, I made the fan holder stronger too. Increased the size of mounting holes for the servo, fan holder, fan shrouds, and M4 bowden holders. I also increased the size of the nut slots on the upper groove mount to make it easier to fit M3 nuts inside to anchor the bowden. -Fixed some geometry issues. Instructions: My first print was pretty bad due to a clogged extruder and some difficulty getting another bowden carrier and new cold ends working. All the same, the fit and size appears to be good. Details and photos will follow when it's working.