Ok so almost complete the commissioning and I tried to auto home the printer. It did x and y axis correct but when it came to the z axis it crashed into the upper support. I tried increasing the z offset but that didn't make any difference (and using my finger under the sensor it didn't seem to change anything). I tried removing the IR sensor which was set at its lowest point anyway and it did detect the bed. So it was obviously too high, that got me looking at the whole x carriage and it just appears to be way too high as even at the highest the bed will go the nozzle still sits about 5mm above the bed therefore I will never get the print bed high enough. Is it simply a case of raising the bed using the spacers between the PCB and bed assembly (that were set to about 2-3mm gap at assembly)? or am I missing something? I have a pro with titan.