This is a bearing based 3KG spool holder that is desk based and fixewd width for stability and function.

For each unit you will also need 4 x 608 (8x22x7mm) bearings and 4 x 20mm M8 countersunk bolts. 

Best settings, 0.3mm layer height, 10% infil with 3 walls, and support or ‘everywhere’ to keep the bolt holes round.