Welcome to the SeeMeCNC Community

I bought an Orion heated bed to use on my Mini Kossel. I figured I'd have to rig up a mounting system. Well, it turns out that the Orion bed's 6 holes line up perfectly with the Mini Kossel 15mm lower frame! Well, almost, it is off by maybe 1mm across the triangle. So, I got six 3mm x 16mm flat head screws. I then drilled the melamine holes oversize to 4mm to give the little extra clearance and the Orian bed's holes 3.5mm. This gives just enough wiggle room to screw all 6 screws into 3mm nuts inserted in the top slot. I used the 6 white spacers to raise the bed up a bit. I may reduce the thickness of these to regain a couple of mms of Z.

cheers,
Michael

Another job well done. Excellent idea but that is nothing new for you.