I made this spool holder because i don't have the place on the sides for a side spool and always reaching so far out in the back is not easy, this way it is still in the back but much more accessible for me.

Place the spool holder in the raiser, it might need a little force but it is designed that way so it will stay in place of its own.

Unscrew the 3 screws on the back, place the back spool raiser in place and use the same screws to connect it to the printer.

I used regular PLA and so far after a couple of prints it all works well.