My partner decided I needed to print something useful.. She uses pastel chalks for art and always gets the in a mess. The box is good for standard rectangular chalks about 10mm square and 25mm long.

The end caps are held in place with 4x small round magnets available from eBay etc. When assembling remember (before adding a drop of superglue) to get the polarity right or the caps will try to spring off !!.