A collection of bits for mounting two xt60 connectors side by side to give a low cost medium current 4 way connector. These connector are a bit over a dollar a pair for dx.com in lots of ten. Should be good for tens of amps. You probably want to avoid PLA if you are going to work these hard as you may melt it. Xt60 can be good for 50amps or so but it may vary from supplier to supplier. They probably need to be derated a bit once inside an extra housing. Some of the part have holes for 4mm M3 flower nuts and some have channels for zip-ties.