I made these parts to keep the ptfe tube parallel to the spool. I had been having issues with how the filament was pulling over the spool because of the weird angle that the A1 spool holder's ptfe attachment pulls the filament in at. This completely negates this issue and allows for the filament to be drawn in parallel to the spool. This comes in 2 parts, and clips right on to the stock spool holder that somes with the A1.