Simple guitar amplifier stand. 3 parts, must print the 2 legs and attach with two, 20mm M3 bolts and nuts. Depending on the material you print with, you may or may not have to press the nuts into place. I super-glued mine.
The maximum width the stand spans is around 15 cm at the top of the arms, and shown above I have a Fender Mustang amp that measures 21cm x 37cm x 34cm (depth, width, height) and fits perfectly with a tilt of around 15-20 degrees.
You may have orient the parts different than how they are imported into slicing software.