Low Pressure Tesla Turbine

GENERAL INFO
Designed for 5x8x2.5 mm bearings and M2x30 bolts with nuts for mounting (you can use shorter ones).
A 5x14 mm output shaft with a 1 mm deep indent.
The inlet inner diameter is 5 mm.
49mm length, 33.5mm without shaft.
45x32 perpendicular to the shaft.

PRINT
Print 30 disks with a 0.15 mm layer height and 0.2 mm first layer with the stiffest material you own (I've used Polymaker PLA)
Use a smooth bed for printing disks.
Print the shaft with the highest layer adhesion filament you own with all top layer settings (I've used Polymaker PETG)
0.15 mm layer height should be the strongest for the shaft.
The shaft has CAD-made supports so that it prints without any wobble. After removing it, grind/cut off the excess.
Print the housing with supports (my design might be hard to remove, especially with high-adhesion filaments, but it looks prettier tho)
The nozzle is tilted 30 degrees.

ASSEMBLY
You should first insert the spacer on the shaft from the longer indent side (if you failed to print it, then just print one more disk, cut off the inner spacer, and grind it to 0.5 mm).
After that, insert all the disks one by one, first layer towards the output shaft; you should be able to insert all 30 of them.
Insert bearings into the cap and the housing and screw them together using four M2 bolts.
You can spray some silicone oil on the inside of the housing for better glide.
After assembling it, you should be able to spin it to maximum rpm with just your blow.
You can measure its rpm by measuring sound frequency, dividing the results by 4, and then multiplying it by 60.
For example, I measured ~1130 Hz, divided by 4 gave me 282.5 rps, and multiplied by 60 gave me 16950 rpm.
Your mileage may vary depending on the filament you used for the disks.
I also measured speed with a 30 g, 5 cm flywheel and got 8200 rpm.

For now the discs are 0.4 mm in width with 0.25 mm spacers; such thin discs vibrate with too high air speed, which limits the maximum speed.
In the future I might test wider discs for higher pressure, which will give me higher rpm but less torque.

I've also made a planetary gearbox attachment for this turbine: