Bambu X1 & P1P Suspended Spool Holder

Some of us have experienced problems when printing TPU where the print starts off fine but ends up under-extruding at some point during the print. This extrusion issue is not due to clogs, partial clogs, or extruder mechanical failure. What we have figured out is some TPU is more sensitive to being pulled through the PFTE tubing compared to others. This can be due to shore hardness, length of PFTE it's traveling through, or other as-of-yet unknown factors. I personally have had different colors of the same make/shore hardness have issues when other colors don't. What we have found is if you suspend the TPU above the tool head and place a short piece of PFTE into the extruder, the under-extrusion problem goes away. If you are printing from a dryer, this model won't work for you.

This model was built by incorporating two other users' projects into a new one. I took a glass top riser model and shaved it down to just the top few millimeters because I didn't need the full thickness that the model provided. If you have an LED holder/rim on your Bambu, this model will not fit snuggly into it, you will have to resize the base, or remove your LED riser, or live with it overhanging a little bit on the back (that's what I'm doing since I don't use this mod much).

I also incorporated a print-in-place roller bearing with the idea that it would allow the spool to spin more freely and reduce drag even more; however, there isn't enough weight on the PVC pipe from the spool to actually engage the bearings and make them spin. The spool just freely and easily spins on the PVC pipe. You could remix the upright holders to remove the bearings which might save some print time???

The PVC holder is sized for ¾" PVC.