spla print parameter test and config file improved —

Founded spla print parameter test and config file improved models & stl files for printing
TEST
Marius82
Overhang test piece
Lars Clausen
Test Tube
HEXApd
Voronoi Test Surface 1
bob_borygmus
Bed Level Test for Select Mini v2
Least Valuable Player
Test Cube 20 mm
Zavadnoy
File Handle
clivebradshaw
Test Tube Mendel
bryanandaimee