Re: Rebuilding my Ord Hadron
Posted: Mon May 23, 2016 3:25 pm
Finally got the bed properly level.!
The Lava bed has nine, sprung mount points and while the spring was installed on the centre mount point, there was no screw as it would have been impossible to adjust it. As the bed seems to be bowing up in the centre, I removed the centre spring (green) completely.
Now I can adjust each corner (red) to the same height and then adjust the side screws blue so there is no gap between the PCB and the glass.
First print after adjustment printed perfectly.
A larger print didn't go as well. There were large temperature variations causing the message 'cold extrude prevented' and subsequent gaps in the print. I've already done a PID autotune so time for a little manual tweaking and more testing.
EDIT: A few tweaks to the PID parameters and now the temperature stays within 2-3 degrees of what it should be. It takes a little longer to get up to temperature initially bit I can live with that if it means I get prints that work. Next issue is cooling. I have a fan but it mostly blows on the J-Head body rather than the print so I think either a second fan, not a lot of room on the X-axis platform for that, or a shroud to redirect the air. The shroud means I'll have to get ABS printing sorted out.
The Lava bed has nine, sprung mount points and while the spring was installed on the centre mount point, there was no screw as it would have been impossible to adjust it. As the bed seems to be bowing up in the centre, I removed the centre spring (green) completely.
Now I can adjust each corner (red) to the same height and then adjust the side screws blue so there is no gap between the PCB and the glass.
First print after adjustment printed perfectly.
A larger print didn't go as well. There were large temperature variations causing the message 'cold extrude prevented' and subsequent gaps in the print. I've already done a PID autotune so time for a little manual tweaking and more testing.
EDIT: A few tweaks to the PID parameters and now the temperature stays within 2-3 degrees of what it should be. It takes a little longer to get up to temperature initially bit I can live with that if it means I get prints that work. Next issue is cooling. I have a fan but it mostly blows on the J-Head body rather than the print so I think either a second fan, not a lot of room on the X-axis platform for that, or a shroud to redirect the air. The shroud means I'll have to get ABS printing sorted out.