This is a spool roller specifically designed to fit and not interfere with the print bed in a RatRig V-Core 4 enclosure while still holding a 3kg spool. This has been tested with the polymaker 3kg spools, and it fits perfectly. I would recommend pan head screws, as they are a bit lower profile.

Hardware required:

• 4 - m3x16 (or longer) bolts
• 4 - 608 bearings

Print tips:

• 1 -  SpoolBase
• 2 - SpoolFrame
• 2 - SpoolRoller