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I have the split files for the T-21 setup on Etzy to help pay for my raw material costs as a hobbiest.
As for selling them it would have to be in the $100's of dollars due to the many hours printing slicing and assembling it takes to do. I could sell one, but I've just never considered there would be any interest for someone to purchase something out of NZ due to horrendous freight costs and the exchange rate. Still something I'd consider with the right offer, if it suited a potential buyer: )
As for the DL-19 yes that is certainly in my to do list, : ) to splice up the following modelshttp://www.thingiverse.com/thing:2127068 All just a matter of time, Cheers Jace