Make use of old magnets and build a swarf collector.

Magnets comes from scrapped microwave owens, and they all seam to have the same size (!?). Print it, and glue the parts together.
 

You need 8 x magnets ⌀57mm (2" 16/64) ~10-12mm (" 25/64) thick with a center hole ⌀20.5mm (~ "50/64), these ones can be sourced from scraped microwave owens.  
Also 3x M6 nuts, a 410mm (16" 9/64) M6 threaded rod and some glue is needed.
 

Print with PETG, layer height 0.2, 15-30% grid infill and no support.

typicall microwave owen magnetsos

M6 threaded rod, M6 buts and glue