Repair

3D-printable JOBO CPE2 parts: a red two-bottle hanger, a red drum stand with grey rollers, and a dark grey control knob with a temperature scale

JOBO CPE2 Parts — Bottle Hanger, Drum Supports and Control Knob

The JOBO CPE2 and CPE2+ are still among the most common rotary processors in home darkrooms, but they are decades old, and the small plastic parts go first: the bottle frame cracks, drum rollers and their holders go missing, knobs break or simply disappear. Original spares are hard to find, and when one does turn up, it usually costs far more than a small piece of plastic should. So I designed printable replacements and upgrades for my own CPE2 and collected them in one open repository: ...

Hand holding the THD Darkroom CP Lift's removed control module, wires and connectors visible, next to the open bath enclosure

THD Lift: Bath Stability, Bottle Lag, and the Opened Machine

The corrected bath-corner readings were locally steady, but the bottle was still warming. The teardown also exposed wet-area wiring problems and identified the installed controller as WH1435A. Small temperature variation does not establish accuracy or electrical safety.

THD Darkroom CP Lift processor on a workbench, showing the control box, water bath, and three processing bottles inside the tank

A Broken THD Lift as a Real-World Test Subject for PanterLA

The pump, heater, and Willhi WH1435A controller operated, but the exposed gear drive failed. Follow-up logging put numbers on the thermal lag: the three-corner mean reached 38°C at 24.3 minutes; the bottle was still below it at 39.3 minutes.