Adapter - Titan Compatible Extruder to Wades Mounting Hole

This is an adapter to attach a Titan extruder to a Mendel90 or other carriage expecting a Wades extruder. This may work with other extruders/carriages with similar mounting styles. The OpenSCAD file is included here and on GitHub Many parameters may be changed, perhaps making it work with less similar printers.

This was designed for a Mendel90 Sturdy variant. I have not verified that the relevant dimensions are the same in the Dibond or Huxley versions. I would love to hear from anyone who has other Mendel90 variants or even non Mendel90 printers about what parameters need to be changed for using this bracket.

I am including STLs for both 3mm and 1.75mm versions. I intend to print both and pre-assemble them with otherwise identical extruders and hotends for easy switching between filament sizes. I have only tested the 3mm version at this time but expect it to function identically.

Notes:

• When I wrote the above I had not yet assembled the 1.75mm version. I did not yet understand that the Titan is meant to have a PTFE tube run through it and into the hotend in the 1.75mm configuration. Nor did I understand that the genuine V6 hotend has a hole which is sized for a PTFE tube rather than just the filament in it's heat sink. I printed my 1.75mm bracket with 100% infill so I was able to fix mine by running a 4mm drill bit down the filament hole. For users who know they intend to run a PTFE tube through their bracket in advance however it makes more sense to just print it that way from the start.Of course users who start with the .scad file or use the customizer (when it isn't broken) can set the filament hole to any size. I am uploading a third set of files with a 4mm filament hole for use with a PTFE tube.

• The hotend bolts to bottom of adapter just like with a Wades extruder. No additional groove mount bracket is necessary.

• The hotend attaches with 3 M3 bolts/washers as per the Wades design. Typically M3 washers are 7mm in diameter. This makes the heads of the bolts close to the hotend. That is not a problem with older J-head style hotends. It can make it hard to reach the bolts with an Allan wrench with newer hotends that have wider heat sinks. 9mm M3 washers are also available though less common. The bolt holes in the attached STLs are spaced for 9mm washers. This makes it a little easier to get a wrench in. 7mm washers might not extend far enough into the groove. Washer size is a configurable parameter in the scad file.

• One weakness of this design is that the length of the hotend bolts must be exact. If they are too long they will extend into the extruder. With the default parameters 11mm is about the right length.

• Another is that the nuts are plain nuts. It remains to be seen if with use the hotend screws loosen. If they do then perhaps Loctite or Nylocs would work. I have avoided using Nylocs because that would require increasing the height of the bracket in order to make room for deeper nut wells.

• Also included is an stl for a modified Mendel90 d-motor mount. This allows the original DB15 to mount to the new extruder. The scad file for this was modified from the original and so is included for GPL compliance but isn't really ready for use yet. If you want to use it anyway download the original Mendel90 code, replace the original scad file with this one, set the extruder type to "Titan" in the config file and run it. There will probably be breakage as I do not have modifications for the rest of the design to include the Titan.

• I am using this with an all metal hotend that requires a fan. I did not want to run an extra wire for the fan. I am not using the probe connector on the PCB. Using a dremel I cut the trace between the probe connector and the thermistor ground. I then soldered a wire between that pin of the connector and the positive supply for the hotend and part cooling fan. At the other end of the ribbon cable I connected the wire that was supposed to be for the probe to ground. Then I connected the fan to what was supposed to be the probe connector and it is on whenever the printer is. This is not reflected in the first picture.

• Best to add no supports via the slicer

• The stl files include a thin support shell for the groove mount which removes easily

• Print top/bottom halves separately

• Print the bottom half upside-down so there is no bridging

• Glue the halves together (ABS juice works well for this if you print it in ABS)

• Run bolts through and tighten with nuts to keep it aligned and pressed together while drying

• If like me you are switching away from the original J-Head hotend as part of this upgrade you will probably need a different part cooler fan shroud. For now I am using one of those cheap eBay all metal hotends that calls itself a J-Head although the dimensions seem to be the same as an E3D V6 but without the enlarged hole in the top for a PTFE tube.I did not want to design a fan shroud from scratch if I could avoid it but I could not find a design that fit either. Fortunately dbondar has shared a parametric fan duct (https://www.thingiverse.com/thing:1362082) which with a little adjustment of parameters works great. I changed trx to 12 and try to 38.This one uses a blower rather than the muffin fan the Mendel90 originally used. It is also less bulky than the original design which is nice because it is easier to see what is happening while it prints. I did find that with the blower I had to turn down the fan speed a bit in the slicer or it would cool my heatbed down enough to trip the thermal runaway protection. You will need to have the fan controlled via pwm, not just a simple on/off pin for this.

This design was based on
- The adapter Thomas Sanladerer designed for his review of the Titan.
- Wades Geared Extruder
- The E3D Titan Extruder
- And the Mendel90 RepRap