When using the BASF Ultrafuse Large 2.5kg Spools or BASF Ultrafuse Larger 4.5kg Spools with your Ultimaker, it's recommended that you use an external large spool holder that you can place beside your Ultimaker to continuously feed your Ultimaker without putting excess force on your original rear spool holder.
We recommend this spool holder with 4 bearings which is made for the 2.5kg BASF Ultrafuse Big Reel or the 4.5kg Big Reel. Standard version is 3D Printed but Deluxe version will be laser cut and made of acrylic.
* Colour may vary, spool holder only, big reel not included on 2nd photo. *