spla print parameter test and config file improved —

Founded spla print parameter test and config file improved models & stl files for printing
AR 15 V1
3CubedEngineer
Sphere Trapped in Cage
Triangle Man
M6 male knob
NPI_3dprint
Butterfly Comb
GurgleApps
Spider Splatter
MajorOCD
Stonehenge
cncMaker1976
Small Pinball Machine
Jeremy Williams