About this 3D model

This thing is simplified shaft coupler designed for 3D printers. 3D Printing applications do not require lots of torque to drive Z axis. Rigid construction works fine if your 3D printer is relatively straight and right. Please see instructions on how to make this thing, or buy ready made couplers: 5 to 5 mm http://www.ebay.com/itm/-/221611355801 5 to 8 mm http://www.ebay.com/itm/321498700056