Ryobi P738 Inflator Nozzle Attachment System

This design is for a more 3D-printing-friendly custom nozzle attachment method for the Ryobi P738 inflator (FDM nozzles replicating Ryobi's design tend to split along layer lines over time). The adapter doesn't permanently modify the inflator and can stay on the tool if you're only using 3D printed nozzles. I tried to minimize the amount of material the actual nozzles require, since there may be many of them, compared to the single adapter.
 
There is also a remix of this system that incorporates storage for a nozzle that also acts as a trigger guard.

Available nozzles are:

• A recreation of the stock inflator nozzle that works with this system (it is compatible with the original Ryobi pinch valve adapter).
   
• A duster nozzle (8 mm exit diameter).
   
• A garden hose adapter (to blow out water). Note this one has not been tested.
   
• Generate your own custom nozzle, just change the exit diameter and height on the upper left under “Configurations”, then right-click the model you want (with wings or smooth) and choose “Export” and select the format to save (most people will want “STL”).

There are versions both with and without grip fins to ease tightening and STEP versions are also available for all models. A model of the nozzle threaded base is included here in case anyone wants to make their own. If you want another type of nozzle that the Onshape creator doesn't handle, request it in the comments or via PM and I'll try to whip one up when I get a spare moment.

I had good luck printing this in PLA with two 0.9 mm walls from a 0.6 mm nozzle. No supports are required.
 

Assembly directions:

1) Attach the split collar over the inflator's output, aligning its pins with the holes in each split collar half. The outer end of the split collar is beveled to ease identification of which way to affix it. The end will also line up with the edge of inflator's output hole when installed correctly.



2) Screw on the outer locking collar. My inflator body's shell halves were separated a little bit, but squeezing them together when screwing on the collar allowed it to turn easily and also closed the tiny gap.



3) Screw the nozzle into the locking collar. The base of the nozzle is designed to seat against the end of the inflator's output to improve sealing. If you find you have trouble attaching and removing the nozzle, consider the version with grip fins.


 

Note that only the nozzle needs to be removed to switch to a different one. The adapter can stay on the tool permanently.