Every time I pushed filament to the toolhead to load, PTFE tube would slip out of the stock Voron retainer. This is my quick remix to use Bambu PTFE coupler (https://ca.store.bambulab.com/products/ptfe-tube-connector?_pos=2&_sid=efb486d5c&_ss=r) in order to alleviate the issue. Plug in the toolhead side PTFE tube on one end, and a short length of PTFE on the spool side. You will need supports for this model to print. I used auto-organic with success.
The author remixed this model.
Use Bambu PTFE coupler in order to alleviate the issue of tube sliding out of the retainer.