This part is a central shaft for the Sharebot 42 spooler for 1kg spool

thingiverse

This part serves as the central shaft for the Sharebot 42 spooler, specifically designed to accommodate a 1 kg spool. The 67 mm length of these spools poses a challenge since they exceed the standard length supported by the typical 750 g spool shaft. Consequently, a 1 kg spool requires an extended shaft that can handle its increased size and weight, underscoring the need for a custom solution where this file is printed and used to replace the standard shaft.