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As far as the 3d printing, you can get local prints done through a 3d print hub, just upload the .stl you need and you will get bids from local hobbyists and businesses. Maybe a combination PVC-3d to save money. The charging can be done without a controller if your cell is low current anyway (which is all you need). Rule of thumb is 10% of battery (AH) charge rate and it will trickle with no damage (For SLA and NiCd). For NiMh, Li-ion you do need a controller built for them. So for a 300mAH battery, charge at 30mA all day, no sweat.