Thread Tap Handle Dormer M25

This is a simple thread tap holder for one of my larger taps.
I would use this when tapping aluminium, plastic or thinner steels.
My gut tells me the ABS would break on the tougher jobs. but this is handy to have with the tool for the quick and dirty job.

The idea is that it fits with the tap in the same case that the tool comes with.

The tool is the Dormer E513M12X1.5NO2, but given the openscad file you could change it to suit yours.
http://www.dormerpramet.com/en-gb/products/product-details?psf=E513&psfid=DORE513

Rounded cube code function included in one openscad file, taken from: http://www.thingiverse.com/thing:9347