I noticed that my printer struggled to pull the TPU when i tried to print it, so i decided to remix a spool holder and an attachment from the A1 mini to make this work way smoother. and it does, fits regular spools no problem and really helps with the TPU
Items need is 2x 608 Bearings of any quality
and maybe a screwdriver to remove the oem spool holder from the arm. If you look closely at your arm when you remove it you will see a small tab on the inside of the arm, press it and pull out the oem arm then replace it with this one!