I have designed an attachment to extend the height of the PTFE guide on the A1, this will enable you to use larger diameter spools like some printed spools which are too large to fit the factory holder. This extender utilizes the the screw which holds the PTFE guide to the original external spool holder, you will also need to use two of the screws for the stiffener which come with the printer but slightly longer screws will also work.

Print in either PLA or PETG

I've been asked a couple of times on how to remove the PTFE support from the body of the spool holder, i've have added a picture to show you the allen screw you need to unscrew.