SDG #174 Testing out a chassis using the Creality Ender 3 V2 with PCBs from JLCPCB

This episode moves the LED soldering microscope ring light project from the bench to a 3D printed enclosure, using a Creality Ender 3 V2 to produce a chassis that must house the assembled boards, keep the LEDs positioned correctly around the objective lens, and mount cleanly to a microscope.

The most instructive part for anyone building their own hardware is the iteration loop. A printed prototype exposes what CAD does not: whether the PCB drops into its recess without filing, whether the screw bosses line up with the mounting holes, how much clearance the wiring needs, and how much first layer squish and the general dimensional tolerance of an FDM printer reduce the designed gaps. Test fitting the real boards against the printed part is the only reliable way to catch those issues before committing to a final version.

The Ender 3 V2 itself receives a practical workout rather than a formal review. It is a budget bed slinger, so the relevant questions are print quality on functional parts, bed adhesion and levelling behaviour, and whether the results are accurate enough for parts that must mate with a PCB. For a project chassis of this size it is more than adequate, and the low cost of a failed print makes repeated design revisions cheap.

The lesson is one of workflow: design, print, fit, revise. Anyone pairing an assembled PCB with a printed housing should allow for at least two or three prototype prints before the dimensions settle, and should design in generous tolerance around board edges and connectors from the start.