Pet wheelchair (small)

DIY pet wheelchair, using 3D printed connectors and aluminum bars.

See it in action here:
https://youtu.be/pwSwQdUgAic

I'm developing a cheap DIY wheel chair, that's can be easily customized and scaled to fit any disabled pet. There are three 3D printed parts, and each needs to be printed in two copies (some files already have both copies aligned):

HortiVerticalAdapter (X2) - This piece connects the width bar with the two length bars.

WheelFrameBandConnector - This piece sits on the length bars and connects each to a wheel bar. It's also the basis for the rear saddle.

BuckleConnector - This also sits on the length bars, and is designed to connect to a buckle, which will attach the wheel chair to your pet's harness.

The original dimensions of these 3D printed parts are designed to work with 1cm wide, 3mm thick bars. The two length bars and the two wheel bars are 30cm long, and the width bar is 20cm long.

EDIT: I added new files that should fit nicely with 12mm aluminum bars as requested (it appears 12mm is much commoner and easier to acquire in Australia. Cheers!).