To save space, I created a new spool on top installation, with vertical axis.
This replace the former spool on top support which was built with ball bearings.
However, with usage, I found that vertical axis for spool tend to drive filament loops to fall down and cross, then make knots and stop prints.
As spool holes are generally larger than 50mm, the spool is never perfectly centered, but this have no effect on the operation.
BOM list :
The spool axis position shall be adjusted depending your printer. You shall resist to the temptation to install it on center, which is generally far from being the best position for good filament path.
These files contains the stl file and also the OpenScad modules
Licence : Equipment OHL V1.2, documentation CC BY-SA
This is a relatively large part (diameter 130mm) to print on the Fisher Delta and I experienced skipping steps at first print. The plate with all printed parts uses 140mm diameter.
The last SD image of Fisher Delta have increased the travel speed from 200 mm/s to 250 mm/s. That may work for small parts, but with the geometry of the Fisher and its short arms, that is not ok for large parts. If still experiencing lost steps after reducing speed, you may reduce a bit the accelerations (G-Code M201)
Hole position on the Fisher delta (with filament inlet top entry, see geared extruder or Fisher spool on top).