My first printer is an Ender 5 Pro. I realized the printer's cube frame has lots of room for clip-on attachments. I wanted something quick and simple to store my digital calipers and came up with this. I offset the posts so the calipers hang straight. I printed it out of PLA and used supports for the posts. I found after a while the PLA seems to ‘relax’ and slide down the extrusion. I put a soft self-adhesive rubber dot on the back of the holder and that resolved the sliding problem.