Optimized Bearing Mount for Sovol SH03

Update: I have improved the design. The revised assembly can be clipped or pressed into the original bearing mount. The connections are dimensioned as a light press fit, so a small amount of force is required for the assembly to snap into the original bearing housing. To ensure free rotation of the inner ring of the ball bearing, I added a 0.2 mm thick front‑side recess.

The assembly improves the fixation of the ball bearings and rollers in their positions, making it easier to insert and remove the spool. The model “Lager Rand” is intended for the outer position, while “Lager Mitte” is designed for the center position. Both models need to be duplicated and mirrored once in the slicer.

As before, the original ball bearings and rollers fit perfectly into the new assembly.

Due to manufacturing tolerances, I added a small protrusion that can be filed down to the required dimension if needed, ensuring that the assembly sits flush.

The original spool holder design creates noticeable resistance due to the position of the roller bearings. This puts additional load on both the extruder and the filament during printing, which can lead to inconsistent material flow.

These models relocate the ball bearings and rollers to the bottom. This improves force distribution, reduces resistance, and results in a smoother, more reliable filament feed.

All parts were printed in PC‑GF or materials with superior thermal resistance. Simply duplicate and mirror the bearing holder and the spool guide in your slicer, then print as many units as needed.

The existing ball bearings and rollers can be reused. The bearing holders are simply placed into position and kept in place by the existing ball bearings and rollers. I glued the two middle parts together to make assembly easier.

In my dryer box, the chambers vary slightly in width — the difference is minimal, but at operating temperatures around 85 °C, and likely even higher near the bottom, thermal expansion can occur. To prevent the bearing end faces from being pressed against each other due to this expansion — which would increase friction — I intentionally avoided using a base or platform. This leaves enough room for the components to expand without introducing additional resistance.