Yes, I do get the white film on the outside of the printer but so far this does not seem to have been a problem for me. I am surprised it gets into your micro switches enough to make them stop working. Probably worth looking for some better switches. Are these the powder sled switches or the powder and build chamber switches? The latter ones are in the back of the machine so should not get too much exposure to powder.

I was surprised just how much powder finds its way into the carcass and I regularly take the machine apart to clean out the excess. Most of this seems to come from the waste powder chamber so I have spent some time sealing this area much better and I am considering making a drop in container to collect all the overflow powder so I can lift it out easily. I also think the big drop of the powder, into this chamber, contributes to the dusty atmosphere in the machine so I also want to try to make this better too.

I love the ability to be able to have such a machine but there are still a few problems to overcome. The parts I have made that do not require absolute accuracy have been excellent and I am very pleased with them but they are all quite small and fit easily within the part of the machine that gives the best results. I appreciate that you require a much larger build area and I am pretty sure that my machine could not cope with a 90 x 90 x 90 build. However, if you would like me to try and could send me a file, I am happy to do so.