This is a small, adjustable support. It is composed of two components, one of which constitutes a bolt and the other a chamber to hold the bolt. You set the height by screwing the bolt up and down.

I designed this to support a leg under a dresser. I have not tested how much weight it can hold. At the time I wrote this, it is holding up my dresser just fine.

It is 30mm wide and can be adjusted in height from about 12mm to 16mm.

I printed this in PETG with 50% infill, a 0.4mm nozzle, and a 0.2mm layer height and no supports.  Print top with the threaded component pointing up.