Extensor Grabber Printer Friendly (STEP)

I've ordered this interesting contraption from https://mathartfun.com ( http://www.mathmechs.com).

I hope it's as serious as it looks. 
The extensor grabber stl files are far from ideal to be printed. Therefore, I've cleaned them as far as possible. The handle is split into two halves to print without supports and to align the filament to increase the structural strength. This needs some glueing but should result in a smoother print.