They annoyed me again that they wanted to sell me 4 grams of lousy plastic at too high a price.

This frame weighs almost the same as the original, but is significantly stronger and significantly cheaper.
approx. It can be printed in 2 hours.
When designing, I kept easy printability and strength in mind.
Minimal follow-up work may be necessary due to the fitting of the 6mm motors. It is worth carefully expanding it with a reamer or a drill if it is too tight. Don't force it, I ruined an motor like that.
The flight control screws may have a tight bore. I expanded this with a thicker needle heated over a flame.
The engine guard is optional, but a useful accessory. Pay attention to the fit of this as well!
When installing motors, pay attention to the direction of rotation, because the motor holder is optimized for this for better flow.
I hold the battery with a rubber ring, to save weight. (and because I'm too lazy to plan)

Update:
-MK2: The layers of the impeller tube separate easily upon impact, so I strengthened it in the critical place. In addition, I increased the part of the landing leg that protects the engine and absorbs energy. This might need to be printed from TPU

-I tested MK2, it is very durable, so I declare it ready.