This is a quick and easy holder for rounding tools, designed for minimal filament consumption (16-20g in PLA). The holder has a small cup-shaped hole that allows the tool to sit straight, whether you prefer to insert it upside down or upside down, as shown in the images.
Other designs have a storage section for extra blades, but I find that unnecessary as this holder can store the extra blades inside (by opening the black tip).
The images show the version without screw holes, but a version with screw holes is also available in the files. This file can be printed lying on your back without support, but be aware that the holes may be prone to breakage if you pull the tool out inappropriately.