I've been gradually replacing parts of my Tronxy P802MA to make it less rubbish, and as part of this, I got a Titan extruder and v6 hotend for it. None of the existing adapters quite fit my requirements, so I made my own.

Mainly, I wanted:

• Modular, expandable design
• Can print with no supports
• Inductive sensor with zero X offset from the nozzle
• Able to fit a CiiCooler
• All the important/interesting things visible from my chair on the X-minus side of the printer
• Most of the weight as close to the rods as possible
• Not too difficult to assemble/disassemble
• Uses as little hardware as possible

The changed settings of Marlin firmware are:

#define X_PROBE_OFFSET_FROM_EXTRUDER 0
#define Y_PROBE_OFFSET_FROM_EXTRUDER -43
#define X_BED_SIZE 200
#define Y_BED_SIZE 195
#define X_MIN_POS -40
#define Y_MIN_POS -25

Some of the sizes may be slightly different depending on belt tensioners, clips, and similar things. Those are what I use.

For those who prefer a smaller Y probe offset instead of the fan mount, an alternative probe mount is included. This replaces both the fan mount and probe mount parts from the standard build. You're on your own for figuring out a print cooling solution though.

Update 2018-12-30:

The next upgrade I made was to replace the inductive sensor with a BLTouch, so I made a mount for that. I've uploaded two versions; the first is simpler, being a single part, but it needs supports for the pins. The second is two parts and requires screws, but prints without support and has adjustable height.

Special thanks:

I used the following models for measurements and/or photos:
E3D Titan Extruder
E3D v6 Hot End
Sensor SN04
BLTouch
Radial Cooling 5015 Fan (50mm) DC12V
CiiiCooler for Wanhao Duplicator i3 / Maker Select
Prusa i3 E3D Titan Carriage

In particular, the belt clips I made are very similar to the last link's. They were re-implemented, however, not directly copied, as the licenses are different.

License:

This is licensed LGPL, because I think it's the only legal license to make it possible to sell printed copies of this. The Prusa i3 design is GPL-licensed, making the Tronxy design derived from it required to be GPL (though they ignore that), meaning this has to use a GPL-compatible license to interface with it. However, it also interfaces with non-GPL parts. I'm not a lawyer, so I could be wrong about this (and please correct me if you are and I am, these license requirements are a pain to navigate) but I think the LGPL fits that requirement. The source code isn't as restricted, however I would like it to at least be legal to sell these, just in case someone should want to do that for whatever reason.

No

No

Any decently-strong material should work. I used a low-cost PETG, but ABS, high-strength PLA, or similar should all work. Heat tolerance shouldn't be a major issue (aside from the Cii) as none of it gets all that close to the hot end.

I printed the main body and belt clips with 50% infill and extra walls for strength, but this is probably overkill. The rest I used 20% infill and regular wall thickness.

All the shapes are fairly large and simple so resolution isn't very important. No supports should be needed, however most parts do have a fairly large flat bottom, so brims may be useful if you have warping problems.

Attach two belt clips to the back of the main body. Glue is suggested, but may not be strictly required if the fit is snug enough.

Depending on your printer's accuracy you might need to file these down a bit; for mine, I just had to make sure the brim was completely gone and they snap-fit together, and I couldn't get them apart again to glue them.

Attach the pillow bearings to the main body with machine screws.

My unit only had 3 screws per block, but there is 4th hole printed on the bottom one where space allowed just in case you want to use it.

Assemble the Titan extruder into the main body, following E3D's instructions.

Attach a CiiCooler to the fan mount, then attach that to the pins on the Y+ side of the main body.

Glue is definitely suggested here as the pins are fairly thin and not all that strong. If you're printing in a high-strength material, it may not be necessary, as there isn't a whole lot of weight on this part.

Attach the inductive probe to the probe mount, then use the pins on that to attach it to the Y+ side of the fan mount.

Again, glue can be used for extra mounting strength.

Designed in Autodesk Fusion 360. Source file included.