changed the oversize method to do lookup based on bearing diameter
rather than bearing part number
the order of the modules has been changed. minor changes to Z axis
added all types of bushings that can be modelled (plain, antibacklash,
with/without threaded bottom)
rename file to better reflect its general purposeness
added colouring to the models
many modelling improvements to z carriage. added motor-side carriage

many more improvements, such as parametric fillets, color and sensible
stuff
changed the colours a bit. some minor modelling changes in Z/Y
added ball spline info
borrowed from the medel90 repository (by nophead)

modified slightly to include two nice-ish wrapper functions for a spring
and a rood with thread
another item loaned from the Mendel90 repository by nophead
added a comment to explicitly state mm measurements of inch units
y carriage model now in its own file
refactored y carriage into own file, fiddled with Z axis to get the motor-end design to work