Hi Guys,

Thanks for taking the time to reply.

Butt_blaster: Strangely, I have a ding on the Y axis rail and have just purchased a replacement for that. Wheels tension looks fine and I don't see any movement of the bed when printing.

Curious Aardvark: many thanks for the compliment. I'm an Ex-aircraft engineer and have always been in the habit of giving as much information as possible. If nothing else it allows people trying to help to rule out a lot and therefore not waste their time. I retired a year and a half ago and the guys at work had a collection for me. I used £100 of that to buy the Ender 3. It was 2nd hand but had not been assembled and was on eBay. To be honest I haven't costed all the upgrades (maybe I just don't want to know how much I've spent on it.....).

Thanks once again,

Andy