The cost depends upon the type and amount of material used in the part.
Perhaps make thinner walls, and add gussets at stress points.
Complexity is not very important, so things like a thin wall
with ribs for strength can save money.
One of our members used http://www.shapeways.com
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to make the "cage" (enclosure) for his CANary project.
Subject: The CANary project
See SOC/GID-Meter and CAN-Do Info
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
Solar PV: 33 x 225W -> 7 kW max AC
Craigslist: Xm5000Li Electric Motorcycle