Recently started 3D modeling/printing and decided to create a knob to increase the leverage on the hard to turn 10-50x parallax. I know this has been produced in aluminum in the past due to other people having this issue. The markings on the knob also leave something to be desired so I put some marks that can be painted as well. I have attempted 3 drafts and so far draft 2 and 3 are perfectly functional and fit tight in the teeth on the knob. Draft 1 was too tight due to material printing dimensions needing to be adjusted. Also has a hole that spans the joint with recesses for a screw and nut to lock it on. The drafts were printed in PLA with 200 micron layers and 20% infill. Ended up printing at 100.6-100.7 scale to get the fit right. Appears plenty strong for the job. If anyone is interested in the STL files let me know.