This is a small test piece I made to use when playing about with support settings. I don't want to print a large item, only to find my supports are no good.
I originally printed out a part with counterbores & when I came to remove the support material, it was fused to the part.
This part is fairly compact 35 x 30 x 12 (Z) and printed in around an hour at 0.2mm layer height for me.
It has a standard clearance counterbore for an M6 cap head, a flat roof section (6mm from the bed), a 45 degree overhang & radiused curve with increasing overhang.
I decided that these are most of the scenarios I would likely encounter where support would be necessary.
Obviously, you will need to rotate this part in your slicer so the flat 'top' is the top piece of your print & the void features that require support will be against the print bed.
If you use this & find it useful, please upload a pic using 'I Made One' to show how your supports come out. Thanks.
I used 20% infill using a triangle pattern. I am sure other amounts of infill & shapes would work fine.
I think I used 3 shells.
Try to pull the supports out & see how you get on!
I didn't really find any test parts for supports, which surprised me. I wanted something that wouldn't take very long to print, but would allow me to see how good my supports are.
I wanted to cover the main types of part features that need support & keep the item compact, but useful.
Because this prints in around an hour (with my settings at 0.2mm layer height), it is a fairly quick way of testing supports & making tweaks