Anet A8 & Prusa i3 Compact Dual Extuder Carriage with Front Mount 18mm, 12mm, or 8mm Sensor!

thingiverse

This is my compact version of my other Anet A8 dual extruder heads. This uses two E3D extruders and has bed leveling sensor mounted as close as I possibly could get it. - BL Touch version here: https://www.thingiverse.com/thing:3160905 - Get the chain here: https://www.thingiverse.com/thing:3179124 Here's the build timelapse! https://youtu.be/tFMRo3YnjW0 This is the front mount sensor version! Everything FITS! You can see in the last 4 photos that the head does not heat up much. It's been printed in heat change PLA that shifts brown to green at about 35c. Hour into this print and it's barely changed since the cold air from the fans passes through the print. I made this one to put the sensor as close as possible to the heads. I think this is the tightest it could possibly be. It has built-in cooling ducts for the extruders and mounts for the stock 30mm fans built in. I used Mistral 2.1A 4.5 from www.thingiverse.com/thing:2121279 as my cooling ducts. You need to mirror one for the other side but they fit and work great. In theory, this should fit any Anet A8 fan duct. The back is just the no sensor one from my other mount: https://www.thingiverse.com/thing:2734717 The fan spacers are included to help clear the fans. Different ducts fit different ways but with the one listed above I found 2 spacers on ear screw worked great. For the lower screw on the side fans be sure to put it through the mount first then spacers and fan with the nut on the fan so it clears the 30mm cooling fans in the front. See pictures! The three clamping screws use Socket Head M4x30 or 35mm with nuts. The head cannot be hex like a bolt or it will not fit in the recess. I found socket head best for torque and easy of use. For the fan mounts, I used M3x30m with nuts. To print choose your parts: - 18mm Sensor With Chain - 12mm Sensor With Chain - 8mm Sensor With Chain To use this please read below! See my Thing https://www.thingiverse.com/thing:2783450 for how to setup Marlin firmware! See https://www.thingiverse.com/thing:2784817 for how to install RAMPS on your printer. Enable RAMPS boards, this is for the common ones like https://goo.gl/4x5dZS. Set the boundaries for probing (where the probe can reach). You also must set: // Travel limits after homing (units are in mm) define X_MAX_POS 240 define X_MIN_POS -10 define Y_MAX_POS 230 define Y_MIN_POS -13 define Z_MAX_POS 230 define Z_MIN_POS 0 I have made a guide in PDF form available here https://goo.gl/1s8jSR for setting the offsets. You will need a serial connection to your printer and I found using Octoprint is really easy. Here's a crapCAD schematic of the optocoupler board I made to run the 12v probe completely isolated from the RAMPS board.  Enjoy! Like! Leave a comment! Thank you! Update 10/16/2018 Added a little bit of play to the second extruder up and down to allow adjustment to meet the level of it's neighbor. This is done by loosening the clamp with the head resting on a level platform. Adjust both to level each other and tighten the clamp!