I remixed this ‘Simple spool holder’ by @n.vh which is compatible with the original A1 Mini Spool Holder Arm. I added a model for the arm itself as measured from the original. The arm is independently compatible with the official Holder.
Thanks a lot, to the original creator for the holder :)
 

Edit: I was originally using the Spool Arm model from ‘A1/A1 Mini spool holder arm’ by @fabio.dimitri. But I wasn't satisfied with the dimensions. I have updated the model with the arm modelled from scratch with measurements from the original.

I wanted a modular system compatible with the original arm just in case, so I remade the arm model and combined them to print in one go.

Printed using Sunlu Black PLA+ 2.0 with 0.2mm layer height. The arm is slightly loose in the holder due to tolerances, but it doesn't affect its function, I did add a layer of masking tape to make fit snugly.
Rate the original models too if this is helpful! :D