xTool D1 leg extensions

These are extra legs the same size and thread as the ones sold by MakeBlock for the xTool D1.  As usual, I have included my Fusion 360 files for anyone to play around with.

I used Cura 5.1.0 with tree supports.  The supports are not really necessary, but keeps the threads dimensionally accurate.  Tree supports increase the print time a lot.  If you don't want to use them, just use one of the original metal pieces to correct the threads.