3D Printable Self-Centering Guide Design

About the project

I need a designer to produce a 3D-printable file (STEP + STL) for a self-centering guide mechanism, similar to the paper guides in a printer tray. The problem: I have a printer whose left and right guides slide independently. They need to move in sync — pushing one side in or out must move the other side by the same amount, so both stay equidistant from the centre. Reference material: Short video with dimensions here — https://photos.app.goo.gl/iah8abrpTQM8XHPPA I've also attached a photo of my own attempt: parts salvaged from another printer and hot-glued in place. It wasn't secure or straight, so it isn't usable. That's the problem I need solved properly. Requirements: Rack and pinion system: two opposing racks driven by a central pinion gear Pinion must sit centrally and be no more than 20mm wide Enclosed housing — gears must not be directly exposed Integrated slides/guide channels so the racks stay captive and can't drift or lift out Must fit the dimensions shown in the linked video Designed for FDM 3D printing (sensible tolerances, printable without excessive supports, no fragile thin walls) Deliverables: Editable source file (STEP or native CAD) plus STLs Any fasteners/hardware specified in a short note (screw sizes etc.) Brief assembly notes Nice to have: Experience designing printed gears and working parts that actually survive real use. Please share examples of similar mechanical/functional 3D design work when applying. If you've read the whole thing and looked at the pics and your bid is a real one for the job then start proposal with the word coconut.

Skills required