jd52wtf made a nice base for the Kossel Mini that I printed out. Alas, it had one fatal flaw. It's missing pieces, pictured on the original, that connect the top brackets to the bottom brackets on the base.

I've created a part and added it in as Pillar_Connector-Rev_2_X_3. I've also corrected the orientation of the rest for easier printing. If you already have the other pieces you only need the Pillar Connector.

It might also be desirable to stiffen up the design a bit more.. I'll be reworking it later if I'm not satisfied with the way it works. Be aware that the insert has zero tolerance so try one first and reprint with a slight shrink on the X/Y if necessary

M4 threaded bolts were used for the connections. I'm not totally happy with their grip and may end up redesigning the whole contraption around better fastening methods allowing for a nut and washer.