I purchased some Bridge nylon and it would not fit on my Airwolf HD2X spool holder because the spool was a smaller form factor with a 3/4" center hole. I designed this to hold the Nylon spool above the standard spool holder and it doesn't interfere with the placement of standard spools when installed.Sliced it in Cura, printed in ABS. Needed to slow down the printing speed on the half round section to allow for the material to cool between layers. The "Tweak at Z" plugin might be good for this, but I just dialed back the federate on the VIKI controller.