Summary

This is a (probably) working metal-printable turbojet that I designed, specifically designed as an optimized version of the KJ66 turbojet. I integrated all of the internal pluming into the design with the addition of water cooling channels near the bearings and stators to prevent overheating. Although I have not been able to manufacture this engine yet, I have designed it to be fully functional and produce thrust somewhere in the range of 60-70N.

All components are intended to be laser sintered out of stainless steel and there are many online services capable of doing so. However metal printing is still very expensive and it will likely cost at least $600 to $1000 to manufacture.

If you are able to get this engine manufactured, use a 5mm hardened steel shaft and high speed brushless motor bearings that are rated to at least 100k rpm. attach the turbine wheel and impeller to the shaft with some M3 and M4 set screws. The water cooling should keep the bearings cool but additional oil mist or compressed air cooling may be required.

make sure to chase the printed threads with a quality tap and use plenty of cutting oil.

Good luck to anyone able to build this model and let me know how it works!