My advice to anyone looking to build a Kossel machine - buy the parts seperately, and if you can print your own parts.
I recently got one of Blomkers kits, and while the delivery, service and 99 percent of the parts were outstanding, the plastic parts he sent me left alot to be desired. Now, luckily I can make my own but for others..Blomker please, fix this or lower your price, because as you can see from my image, the base corners they sent me, are for lack of a better word, terrible. They advertise "The parts are printed on our own Kossel mini!" Well, not a good example. I have managed much better prints out of the machine I built with your kit and my plastic parts.
(on a side note, the metal sliders all went rusty very quick too :( )
All of Blomkers orange pieces are split, warped and so bent out of shape they are completely unusable. Granted, this may have happened over time with parts printed in PLA degrading (although I have never had a PLA part degrade like that.. but heard it can happen with bad PLA..) but this is why you make printers with ABS. Imagine building your printer and within months the frame is degrading and you have to rebuild it all over again? nope not for me.
The saddest part, they were very nice to deal with and the kit itself, instructions etc were the best I've ever been sent - so it was really a disappointment when the parts they send are nowhere near the standard of anything else in the kit.