Hobby / Needle File / Hex Bit Caddy

Update 2/12/17 I added a version of the hex bit box and the three row file caddy that have a bottom surface that prints on the model (opposed to a bottom you have to glue on). This allows you to print the model, pause the printer before the top is printed, add sand or other filler into the cavity, and then continue printing the top surface over the filled cavity. This gives you a one piece item filled with sand or other filler that is ready to use when it comes off the bed. You could use infill if you don't care to add a filler and print in one piece as usual. See the notes below for more info.

Update 1/9/17: I've printed later items with only 1 perimeter and they are more than strong enough for the purpose intended if they are filled with sand. I used a 0.4 mm nozzle and 0.3 LH. Any nozzle smaller than 0.4 mm might not yield thick enough walls to be serviceable with only one perimeter.
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Note: These items were designed to be filled with sand to sta