Hello
This forum has been a big help to me, thanks to all that take the time to respond. I did search but could not find a similar fault/fix.
Had an UM2 for 3 years - no real issues. Two weeks ago I upgraded to the + (including firmware) and since then I've had intermittent issues with the start of the print. The nozzle will be anywhere from 1mm to 5mm away from the bed for the first layer, so it prints in fresh air.
Bed leveling / calibration = makes no difference (tried 10+ times - bed is level and just a bit of friction between the paper and nozzle)
Factory reset = made no difference
Sometimes I power off the printer, power immediately back on, start the print and all is good - even if 30 secs ago it was printing in fresh air. Sometimes I need to do this 4-5 times before it works.
As an additional note: At the same time this ^ fault appeared, I started to get the error 'Error stopped - Z switch stuck' - but powering off and on clears it every time.
Both are intermittent issues - if there is no Z error and the first layer is down correct - the print turns out great.
Thanks for any suggestions (that won't cost me more money )
JW