I concluded that the Tophat was just not quite tall enough to prevent the umbilical and reverse bowden from pressing against the top panel when at Y120, rear of bed.
I found that if I made the umbilical slightly shorter, then, when the head was at Y0 front-of-bed, it would pull the top of the head backwards.
And if I made it longer to prevent this pulling of the head, then when at Y120, the top of the umbilical loop would press hard against the top panel.
For the riser panels, they were really intended to be acrylic sheet, but you can also print them. I have included a .dxf as well as .stl file for the side panels so you cut them from acrylic or print them.
Riser Corners A & B need a M3x4 brass insert if you want to secure the Tophat to it.
Here's the Printing BOM:
- Riser Corner A x 2
- Riser Corner B x 2
- Riser Panel x 4
- Riser Panel Clip x 4
- Removed the Locking Tabs from the Corners
- Made the Side Panel Slot in the Corners twice as deep (4mm > 8mm)
- Made the Side Panel end-tabs longer (4mm > 8mm)
Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4949069.