Free 

This 3d printed Milwaukee m18 is a battery adapter that you can connect to anything you want. Most of the one I've made were for to be use in a powerwheel kid cars.
The hole are made to be used with 12 AWG (76822.R8.03 and 76822.R8.01) and the connector 1599052-1-SI-ND CONN QC TAB 10-12AWG 0.250 CRIMP from digikey
3D printing settings
I've used these with : 4 Wall 20% infill Support for the connector holes and the clip. Printed it with the + and - to be on the bed.
0.2mm layer, 4 walls, 20% infill 4 Wall 20% infill Support for the connector holes and the clip. Printed it with the + and - to be on the bed.












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