A microscope slide holder for 26 x 76 x 1mm (1" x 3" x 3/64") microscope slides. It can hold up to 3 slides, makes comparing slides easier. Sometimes I have to check 20+ samples and also compare them at times. This helps me do it without swapping slides each and every time.
The microscope slide holder dimensions are:
86 x 128 x 3 mm
The slide holder fits on our Olympus inverted microscope with linear rail holders.
Infill percentage doesn't really matter, 100% will increase print time slightly compared to lower percentages. I did mine 100%.