i made this mount to fit dual e3d v6 clone hotend's on to my cheap ctc prusa i3 pro b with this X-carriage http://www.thingiverse.com/thing:1329854 by Sectorix. I had been using https://www.thingiverse.com/thing:617691 by Triggerr and loved it, so thought id try and remix. The cover has a hole for a 12mm inductive sensor (it's a tight squeeze but does fit), and 2 5mm LED lights, and a 40mm fan. I pointed the ducts up to reduce drafts onto the prints. This is still a work in progress, im currently testing it and so for the only issue is clearance on the the left front bed bolt, since i run a 3mm aluminum heat bed i just removed the bolt. i made this on tinkercad and im a NOOB to designing but i did my best. The 4 mount holes are for 4mm nuts (using 4mm i couldn't move it around) so once installed using 3mm bolts and nuts the mount can be leveled a bit so you shouldn't need a Z-offset. the X-offset i have is -29.4mm (my #1 is on the right). I still use the GT2560 clone board that came with my printer which has the atmega1280 chip (works well except for the lack of memory). To get dual extruder settings to fit and bed leveling to fit in the memory i had to shut off PID temp and go with Bang Bang heating.

8/19/17
Added picture of fan installed, I have learned that if using PLA you should definitely cover the hotend with at least cotton insulation so the fan duct doesn't warp on your first layer without fan or when you're print finish's. I still haven't created the servo with touch sensor yet but it's on my to-do list

EDIT 6/12/17
Added Fan duct, i just finished it and sent it to printer. Sorry about the design, im still learning Tinkercad. So far squares, holes, and wedge's are what i can figure out. I wanted it to have basically a teardrop cross section but that's beyond my abilities, Soooo wedge it is. Fan duct uses 2x 30mm fans, the ones that came with my v6 hot end are what i measured it up for. the holes should allow the screws to thread straight in with no nuts

custom ctc prusa i3

No

Yes

0.1

20%

UPDATE 6/15/17 added fan duct v4 it is narrowed 12mm

added v2 fan duct due to thin walls near fans, added v3 fan duct for ease of printing with supports (cura is temperamental for me),

UPDATE 6/13/17 Yet another update, finally finished printing and installing fan duct v3, there is a clearance problem between left side and left z axis coupler when homing, in my hast to try it out after printing the bottom warps. I will narrow the total width and slot the mount holes for height adjustment. 2 30mm fans is a bit much but works.

eventually ill do a cover version to use a servo with optic end stop instead of an inductive sensor. To assemble you need 2x 3m x 35mm for the outer holes and 1x 3m x 20mm for the center hole 3x 3m nuts for the recesses on the rear of the mount. To mount the sensor i fit it through several times top and bottom to get the snug fit i liked then added the nut to the very bottom side where it sticks out of the cover. Once getting the sensor height i backed off the nut and added a bit of hot glue and snugged up nut again to keep it from moving. LED's are just pushed into place

Let the prints cool properly or they will warp, basic pla clean up