Hi Nick,

I am sure there is a fault in the design. I have used triangles to get rid of problems with non-coplanar points. I have tried Cura and also used an online service to check the .stl and it looks fine.

Can you explain 'manifold' please? I have looked at the model for open areas in the wrong place and could not find any.

Life is just getting me stressed at the moment. I have severe arthritis in my knees and hips and the constant nagging is getting to me.

After a lot of problems with my extruders, I decided to replace them lock stock and both barrels. The replacement was £170 from Wanhao UK and £75 from Wanhao China. Delivery was £25 by UPS and Import VAT was £19 but then UPS added £11.50 for Customs Handling. So £130 all in (roughly). Fitting was 2 screws and a load of cables to plug in. Level the bed and away we go! First print was superb, but subsequent prints will not stick to the bed. So I have some furtling with print temperatures to do.

In the meantime I tried to cut a door push plate as my cream perspex sheet had arrived. Change collet to 6mm to cut the chamfer on the plate, then back to 1/8 for the engraving and cut-out, but 1/8 collet has disappeared off the face of the earth - now into 2nd day of collet search. It is a Kress collet and clamp nut, so can't just nip down to Arc to get a new one!

Cheers,

Rob-T