You can use the settings below as a reference. The parts are oriented in the center of the bed and ready to print "as is". They do not require any support material.
3 top/bottom shells
50mms print speed
about an hour and a half to print all four parts.
The parts were modeled in Autodesk 123D Design and available to modify. The file includes the original solids and sketches.
These parts have been printed in PLA but should print without any problems in ABS or other materials like bamboo and metal filaments.