98mm inverted mini quadcopter frame

I've made this frame to remake my miniquad on my own frame with costruction similar to "owl" frame.
Also I wanted It to be a push frame (push props are a bit more efficient).

I have a 25mm flight controller with 20*20mm mounts - any controller with this mounts will fit.
I used 4 esc, but 4in1 with 20mm mounts will fit.
For spacing I used 15mm m3 stands.
Motors - 1104 7500kv with 56mm 2 blade props.
I use 2s batteries 450mAh.

I printed this frame with nylon, It is quite hard material to print. PETG should also work

UPD 1: modified bottom plate for better duct printing (optimal for 0.4mm nozzle)
UPD 2: increased outer ring width from 1mm to 1.5mm
UPD 3: added alternative design with corner spacer mounts
UPD 4: for alternative design moved spacer holes a bit
UPD 5: made ducts fully round without breaks. Also printed in Polyamide - the result is much better