High-Strength Magnetic Shelf

I use magnetic surfaces to organize my work spaces, but have had trouble finding sturdy enough magnetic shelving to hold miscellaneous bits and pieces. This print is a basic print-in-place shelf with a 9.5 x 3.5 x 1.5 inch internal area for general holding. I included no wall cut-outs to prevent small pieces from fall out. It has 16 8x3 magnets in the back which provide an incredibly sturdy hold, however the actually strength will heavily depend on what surface you are attaching too.