Sculpfun S9 air assist nozzle in OpenSCAD

Acknowledgements: This is very important! This OpenSCAD design was heavily based on the design by Nunu57 (on Thingiverse) and I freely and gratefully acknowledge the work he put into creating his design. The only reasons for modifying this were (a) I had trouble with the air inlet nozzle, which kept breaking when I tried to clear the supports, and (b) I wished to experiment with things like putting a metal insert into the nozzle orifice - making my own source meant that I could change things as I see fit.

If all you want is an air assist nozzle, and have no wish to modify things, then Nunu57's design is absolutely fit for purpose.

Design options: There are two forms of nozzle - curved and straight vanes. The curved vane version can only properly fit in one position to match the vanes on the laser unit's heat-sink, so it comes with two choices of inlet pipe position - to the left as you face the laser, or to the right. This option gives the absolute minimum resistance to air flow for the laser's built-in cooling fan. You will have to modify the code if you want the inlet pipe to come in from any other direction.

The other choice is the straight vane version - this can have the inlet in any position, at the cost of a little extra resistance to air flow from the laser unit's fan (but not a lot).

None of my versions include an air inlet pipe: I have designed it so that a 4mm o.d. metal pipe can be glued into the air inlet hole, which gives a robust connection that isn't dependent on the skills of the 3d creator to produce. I bought some brass 4mm o.d. tube off eBay for quite a small amount of cash (some suppliers will sell a 50mm sample for little more than the cost of the postage, which is enough for this piece).

You will also need an o-ring for the recess, which will make a seal for the pressurised air. These can be found on eBay, 16mm outer diameter, 11mm inner diameter and 2.5mm section. Try to select the softest available - mine uses a silicone material.

Please refer to Nunu57's description for all the other important details, such as details of the o-ring and air hose. He also has designed some very good air hose clips to match.(https://www.thingiverse.com/thing:5186927).

I printed my nozzles at 0.2mm layer height, 30% infill, using PETG. I recommend that you use whatever settings work for you and your printer.

Be careful about the filament you use: for example, ABS can give off poisonous gasses if the laser beam accidentally contacts the material, whereas PETG and PLA will just melt away.