E3D Titan Aqua Mount for i3 mk3 by ChrisVahi

Last crawled date: 3 years ago

After a firmware update erasing my printer's calibration I found a flaw in this design. I have abandoned this project in favor of this one:https://www.thingiverse.com/thing:3150843
Please check it out and let me know if it works for you.
Here is my mounting fixture for the E3D Titan Aqua. I've been using it for a couple of weeks now with only minor issues. I will be continuing to work on it but I invite you to add to the project as well.
This part has been designed to be compatible with the factory X carriage. You may need to open up the hole in the rear X carriage cover depending on how flexible your plumbing tubes are. I am using clear nylon tubes at the moment and they needed just a bit of extra clearance. I started with black air brake tubes which fit without modification, but I could not monitor coolant flow. The tubes are run through the bottom of the electronics enclosure and into the main extruder cable assembly. I have removed the factory nylon filament in the cable assembly as it is no longer needed.
Added July 25, 2018: Prusa filament sensor - This part is designed to hold the Prusa Laser filament sensor. Please print this part with black filament to maximize the sensor's effectiveness. It is prone to false positives but blocking as much light as possible will help it work somewhat better. The filament sensor holder clicks onto the standard Titan idler and has ports for 4mm x 2mm Teflon tubing in and out of it. Cut a piece of tubing ~30mm long an insert it into the bottom of the filament holder, then insert the assembly over the idler until it clicks into position. Attach the top and insert the upper tube into the port. This part should be compatible with all of the Titan family extruder idlers.
NOTE: I have had limited success using this filament sensor. The holder works fine but the sensor does not work well with co-polyesters like nGen or XT, which is what I use primarily. I just wanted to provide a part that keeps all of the features that came with your printer. Please provide feedback is you find any issues using PLA, ABS or any of the known-working filaments with this sensor. I did have to flip the sensor to get clearance for the Titan and I'm not yet sure if there are firmware mods required to detect the filament accurately.
Added July 19, 2018: Print Cooling Fan mount - this is my current working model. It uses the new angled Prusa fan nozzle, which I've added to the thing files. Bolt it onto the left lower lug of the extruder. I STRONGLY recommend using the e3d heater block sock to prevent melting your fan nozzle, especially if printing materials that can not be cooled during printing. Even then, you may consider running the fan at it's minimum speed to keep your parts safe. You will have to rotate the heater block ~60 degrees so the long axis is inline with the nozzle center. Loosen your nozzle, then rotate the block and re-tighten the nozzle. Follow the instructions on e3d's website for changing a nozzle ( they say to use pliers to secure the block, I use a 5/8" or 16mm wrench): https://e3d-online.dozuki.com/Guide/Changing+Nozzles/45 .
Update 7/27/18: I have edited the mount a bit to thicken the wall for the PINDA probe. Also gave a bit more clearance for tubes
Please use the following firmware mod to adjust the position of the PINDA probe for calibration and homing. For information on editing the firmware, follow the instructions in the readme here: https://github.com/prusa3d/Prusa-Firmware. Just remember to make these edits to all firmware updates in the future.
In your configuration_prusa.h file (rename the file that matches your printer in the variants folder and move to the firmware folder) locate the following lines
_#define X_PROBE_OFFSET_FROMEXTRUDER 23 // Z probe to nozzle X offset: -left +right#define Y_PROBE_OFFSET_FROM_EXTRUDER 5 // Z probe to nozzle Y offset: -front +behind
and replace them with
_#define X_PROBE_OFFSET_FROMEXTRUDER 48 // Z probe to nozzle X offset: -left +right#define Y_PROBE_OFFSET_FROM_EXTRUDER 0 // Z probe to nozzle Y offset: -front +behind
In order to use the Titan Aqua you will need to change the extruder rotation direction and the extruder steps per mm. There are two ways to do this. I recommend swapping the red/blue pins or the green/black pins on the cable connector at the controller. Extruder steps per mm can also be changed in the EEPROM by sending the following g-code:
M92 E840 #change extruder steps to this value
M500 #store settings
M503 #to verify settings changed
If you prefer to do things in firmware then find the following lines and replace with these values.
_#define MAX_E_STEPS_PER_UNIT 1700
for Prusa stepper (200 steps/rotation):
_#define DEFAULT_AXIS_STEPS_PER_UNIT {100,100,3200/8,840}
or for e3d stepper (400 steps/rotation):
_#define DEFAULT_AXIS_STEPS_PER_UNIT {100,100,3200/8,1680}
(NOTE: I had problems with linear advance causing stalling and in-print flow control not working using this value/stepper. Changing back to the stock Prusa stepper seemed to solve this. I think the 1680 value has too many bits for whatever math the firmware does while calculating extruder speeds. That was on firmware 3.2.0)
and extruder direction:
_#define INVERT_E0_DIR 1 // for direct drive extruder v9 set to 1, for geared extruder set to 0
(NOTE: the comment on the above line appears to be backwards, but adjust to suit)
Hardware required:
4x 4mmx25 socket cap machine screws (extruder mount)
2x 3mmx20 socket cap machine screws (fan)
1x 3mmx10 socket cap machine screw (fan nozzle)
3x 3mm nuts (fan mount)
8mm x 3mm magnet + super glue (vizualizer)
zipties for reassembling the cable harness
(in a pinch you can use the 4 mounting screws from the Aqua kit run in through the front of the Titan frame into the mount. This means you are first threading into aluminum, then through into plastic. Not ideal, but it has been working for me and it makes servicing a bit easier too. I'm considering changing a few things to use 3mm screws with captive nuts instead, let me know if you'd like that edit!)
Here is a link to my Fusion 360 account if you want to download the source file:
Extruder Mount- https://a360.co/2mvuhsl
Fan Mount - https://a360.co/2mxZ73s
Filament Sensor holder- https://a360.co/2NM9ufp
Have fun!