This is a roller design that will take two bearings (4mm internal diameter, 10mm external diameter) and replace the top bearings. One of mine had a bearing collapse and this part was designed to use larger, more resilient bearings.

The design should allow for press fitting of the bearings, try and push them home while the part if still slightly warm to help fitting.

Thanks for looking!

Geeetech Rostock G2s Pro

No

No

0.2mm

100%

Use a high fill as this part is under stress when in use..