Several of the commodities needed by the engineers may be bought at certain stations. I've made a route planner with locations for these commodities and all the known engineers.
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Note: I've selected just one location for each commodity, thought the other locations are usually nearby to these. Where possible, I've picked one with a station close to the star.
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Example of how to use:
Once I have all the other ingredients sorted, I want to take my Python to Tod McQuinn and upgrade a few multicannons.
From the commodity list, I need Heatsink Interlink, Magnetic Emitter Coil, Radiation Baffle and Reinforced Mounting Plate.
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From my current "home", the closest commodity is radiation baffle at Pleutarama, 131ly.
From Pleutarama, it's 126ly to Findalibila to get reinforced mounting plate.
Findalibila to Vetta is 84ly to get heatsink interlink.
vetta to Chemaluk is 184ly for magnetic emitter coil.
Chemaluk to Wolf 397 is 82ly to see Tod.
The return trup to "home" from Wolf 397 is 273ly.
Total trip is 880ly. But it would have taken me 546ly just to go to see Tod without buying any commodities at all. Well worth the detour.
.

.
Note: I've selected just one location for each commodity, thought the other locations are usually nearby to these. Where possible, I've picked one with a station close to the star.
.
Example of how to use:
Once I have all the other ingredients sorted, I want to take my Python to Tod McQuinn and upgrade a few multicannons.
From the commodity list, I need Heatsink Interlink, Magnetic Emitter Coil, Radiation Baffle and Reinforced Mounting Plate.
.
From my current "home", the closest commodity is radiation baffle at Pleutarama, 131ly.
From Pleutarama, it's 126ly to Findalibila to get reinforced mounting plate.
Findalibila to Vetta is 84ly to get heatsink interlink.
vetta to Chemaluk is 184ly for magnetic emitter coil.
Chemaluk to Wolf 397 is 82ly to see Tod.
The return trup to "home" from Wolf 397 is 273ly.
Total trip is 880ly. But it would have taken me 546ly just to go to see Tod without buying any commodities at all. Well worth the detour.
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