try at a more modular recipe architecture.

NOTE: some of this syntax isn't toml i don't think, so this should be
treated more like pseudo-toml

modular-recipes/peristaltic-pump/peristaltic_pump.toml

@@ -0,0 +1,33 @@
+[[inputs]]
+pump_housing_front_with_stepper = {version = 0.1, quantity=1}
+bearing_roller = {version=0.1, quantity=1}
+pump_housing_rear_with_stepper = {version=0.1, quantity=1}
+tube_support = {version=0.1, quantity=1}
+
+[[inputs.silicone_tubing]]
+type = "silicone tubing, 6mm OD, 4mm ID"
+quantity = "1 meter"
+comment = "PVC tube isn't flexible enough.  Adjust quantity to suit your application."
+
+[[inputs.m4_25_bhcs]]
+name = "m4_25_bhcs"
+type = "M4x25 BHCS"
+quantity = 4
+comment = """BHCS is preferred over SHCS so the screw heads sit recessed
+below the surface of the pump body."""
+
+[[inputs.m4_nuts]]
+type = "M4 nuts"
+quantity = 4
+
+[[dependencies]]
+tools = [ "3 mm hex driver" ]
+operator = {skill="assembly"}
+
+[[action]]
+process = """Press the bearing roller assembly onto the motor shaft of the
+rear pump housing assembly.  Install the tubing so it goes in one port,
+around the roller, and out the other port.  Press the motor shaft of the
+front pump housing assembly into the other side of the bearing roller.
+Attach with the screws and nuts."""
+