I didn't have the correct bit (3/8" (9.5mm) socket adaptor drill bit) for The Respool Tool (https://www.printables.com/model/325988-the-respool-tool-respooler-) so i made one. 

Printed in PLA with 6 walls, 5 top and bottom layers and with 25% gyroid infill. Like The Respool Tool, i wouldn't use this with spools larger than 1kg.