Ultra-low friction TPU Spool Holder

Zero-Friction TPU Spool Holder (ultra low friction) with Ball Joint Guide

Optimize your flexible filament prints (TPU 70A 85A and beyond) with this holder designed to drastically reduce friction. The integrated ball joint guide ensures smooth and constant tension, eliminating the risk of under-extrusion due to filament stretching.

Compatibility & Models:

• Version A - H2 series model: Compatible with H2D, H2S, and H2C
• Version B - P1, P2, X1, and X2 series models

Highlights:

• Print Quality: Ideal for TPU 70A and 85A without having to manually unspool your filament (except for extremely sticky filament)
• Flexible Installation: The holder slides on the rail to position itself at the front, back, or center depending on your setup
• Easy Assembly: 100% mechanical assembly with no screws

⚠️ Technical Note: Requires the use of 2 608zz bearings for maximum fluidity.

Assembly (see gif / video):

1. Clip the arms and end caps, then clip them onto the printer
2. Position the roller with bearings into the spool, then clip the bearings into the end caps at the ends of the arms
3. Pass the filament through the ball joint
4. Do not use a PTFE tube between the holder and the print head
5. PTFE tube holder available here: https://makerworld.com/fr/models/2065587-ptfe-tube-support-in-tpu-for-tpu-filament#profileId-2230567

Printing :

• Print the ball joint and roller in PETG (lower friction than PLA...): note that the ball joint has supports which require PLA at the interface
• insert a PTFE tube into the ball joint and trim the ends that extend beyond the ball joint

WARNING : 

• you must be present at the start of printing because the calibration sequence can unspool the filament onto the print bed due to the system's low friction...
• If printing multiple parts, it may be necessary to reduce the travel speed (e.g., decrease from 1000mm/s to ~ 400mm/s) to prevent the spool from unrolling during printing

Recommendations for TPU 70A and 85A print settings:

• print with Bambu settings using a 0.6 nozzle and a 0.18 layer height (much better results and almost no loss in print time compared to a 0.3 layer height)

• filament flow parameter (flow ratio): can be increased to 1.05 or even 1.1 to improve mechanical strength and hardness