A1 AMS Hub with 9 Ports - Updated

An AMS 9 port hub to replace the stock 4 port.

I'm adding a second BMCU AMS and wanted a hub with the capacity for both sets of AMS tubes and an additional tube for an external roll. I also wanted it to look close to OEM. 

It's important to note! This is a small parts print with tight tolerances. You need to be calibrated, (Temp, Flow Rate, PA, Retraction, Shrinkage, etc.) Or, you may have issue with the parts fitting correctly. 

There are two versions: 

• The first uses locking rings and collets (similar to stock). This is the best version for use on the Toolhead.
  • New version - uses a printed collet assembly with locking rings from donor fittings.

  • Original version - I used the 4 collets from the stock hub and printed the other five. Use PETG or better for the collets  The locking rings are a mixture of the four from the stock hub and five individual rings from disassembled donor fittings.

     

• The second accepts the PTFE tubes directly. It is less secure but does not need the extra parts as the version above.

Updated 

Hub Cap v3 - Created a new collet assembly that makes removing the tubes for maintenance a bit easier. Instead of individual collets, it groups the tubes in fours. One for each BMCU. It must be printed with a material that has good layer adhesion. I used PCTG. 

Assembly- 

1. Start by inserting the “Middle_Collet” into the Hub. 
2. Insert, the “Corner Collet”. 
3. Insert the “Center collet”. 
4. Place a clip ring over each hole in the top of the hub and clip the Cap to the hub.

Once inserted the collets don't come out easy. It you insert them out of sequence or for some reason want to remove them and reuse the cap, your best option is to cut them up to remove them. 

Clip Version and Hub Brace- v4 - Added strain relief and limited the distance the PTFE tubes can be inserted. Strain relief requires the use of a M3x4mm button head screw to limit the hubs travel. Version four of the clip hub also has improved internal geometry to guide filament. 

Both versions require the use of the stock magnet and the locking collar. Magnet orientation is important! If you get a filament error when trying to print, the magnet is installed incorrectly. remove and flip the magnet lengthwise.

There is a matching hub brace that requires 2 – M3*10 course thread socket head screws to replace the two factory hub screws.

Hope you might also find it useful. If you do, please consider giving it a boost.  It would be greatly appreciated!