This design is based on a mini Lego Duplo police helicopter. And it accepts the bigger Duplo figure. Easy to print 3 piece model.
I designed it in Fusion 360 and used some bricks for size reference from here https://www.thingiverse.com/thing:615256
The .step file is included if you like to customize.
Printed in PLA with 3 perimeters and 4 top/bottom solid layers.
While printing the main body I made a color swap.