Has anyone found a good way to hold the print bed firmly on the heat spreader and not slip?
The foldback clips don't work for me even if I just clip them over the edge, because on the end of the bed nearest the Y-motor the fan housing fouls on them, and at the other end the IR sensor fouls on one of them. So only 1 of the 4 clips is usable on my Ormerod.
I tried attaching the bed with Kapton tape to the MDF. This was OK initially; but when I did a longer print, it didn't hold (became detached from the MDF on both sides). This cause the bed to rise and slip, spoiling the print.
I could try using four small pieces of double sided sticky tape, but this will reduce the contact between the plate and the heat spreader, and may make it difficult to separate the two.
I'm going to try using a heat spreader plate and glass plate that are oversized by 30mm at each end. Then I will be able to use the foldback clips There is the risk that the extra aluminium will suck too much heat away from the edges of the bed, causing the bed temperature to be less uniform. But this is not likely to be a problem until I start doing large prints. However, the aluminium sheet I have ordered to make the new heat spreader is not likely to be dispatched until next year.
In the meantime, does anyone have any suggestions? I'm reluctant to try any large prints until I have this solved.
The foldback clips don't work for me even if I just clip them over the edge, because on the end of the bed nearest the Y-motor the fan housing fouls on them, and at the other end the IR sensor fouls on one of them. So only 1 of the 4 clips is usable on my Ormerod.
I tried attaching the bed with Kapton tape to the MDF. This was OK initially; but when I did a longer print, it didn't hold (became detached from the MDF on both sides). This cause the bed to rise and slip, spoiling the print.
I could try using four small pieces of double sided sticky tape, but this will reduce the contact between the plate and the heat spreader, and may make it difficult to separate the two.
I'm going to try using a heat spreader plate and glass plate that are oversized by 30mm at each end. Then I will be able to use the foldback clips There is the risk that the extra aluminium will suck too much heat away from the edges of the bed, causing the bed temperature to be less uniform. But this is not likely to be a problem until I start doing large prints. However, the aluminium sheet I have ordered to make the new heat spreader is not likely to be dispatched until next year.
In the meantime, does anyone have any suggestions? I'm reluctant to try any large prints until I have this solved.