Drive Chain fully parametric

build your own drive chain with the parametric chain.scad script
or just use one of the exampels (test_chain.scad)
example 1
- easy assembly / disassembly but not really strong
- 35° overhang and 0.4mm gap make the print easy
example 2
- same like example 1 but with a snap_fit hinge (stronger)
example 3
- real strong chain but can not be decomposed
example 4
- same like example 3 but the first chain-link have a snap_fit hinge
example 5
- another easy assembly / disassembly chain hinge
- this chain is bigger then the other examples
example gear 1
- fits on example 1-4
- 9 teeth
- M4 hex_nut hole
example gear 2
- fits on example 1-4
- 20 teeth
- M8 hex_nut hole
example gear 3
- fits on example 1-4
- 8 teeth
- 5mm motor mount (need a M3 nut + screw to fix)
example gear 4
- fits on example 5
- 15 teeth
- M6 hex_nut hole