About this 3D model

Octagon shaped handle for Biltema 10 piece small file set. Rods are about 45mm long and 3mm diameter, the hole for the rods in this print is set to 3.5mm. Total build height is 50mm, and contains 2 hollow spaces to save filament but still conserve ruggedness. Print clocks in at 28 minutes at regular speed on my printer. Needle file set looks something like this: http://www.amazon.co.uk/Sivitec-Needle-File-Jewellers-Files/dp/B00DFP6SS0/ref=sr_1_6?s=diy&ie=UTF8&qid=1408148882&sr=1-6