PopLite Coffee Roaster

thingiverse

This is a project aimed at transforming a PopLite popcorn popper, model #0486001 (1440watts), into a coffee roaster. The conversion process will be documented here with updates on parts, build instructions and pictures as they become available. The glass tube used in this project is a Pyrex Bake-A-Round Bread Loaf Mold Baking Tube purchased from Ebay for $15 - $20. An alternative source is Etsy. The can used was a re-fried bean can with a 101mm OD that fits perfectly inside the screws of the popcorn popper. Next steps include building a control box using an Arduino UNO R3 and SSR to regulate AC power, fan speed and read thermal couples for PID control. Additionally, an aluminum funnel needs to be created within the roasting chamber to direct hot air at a better angle. A re-fried bean can and steel screen will serve as a chafe catcher covering the top of the roaster. UPDATE: Two parts have been posted that form a valve to control airflow from a mini shopvac. It is essential to separate the two areas of grillwork in the center piece, as they tend to break when printed with PLA and may cause a mess if they fail during roasting. To achieve better airflow, run a length of shopvac hose from the vacuum output to the valve, then from the valve output (the longer side) into the blower base. This setup allows for more effective vacuuming and may enable hearing the first crack over the blower sounds. Determining how much coffee can be roasted involves turning off the roaster/heater and turning on the blower/vacuum. Gradually add green beans until just before they stop circulating. When the heater is turned back on, the impeller will provide additional lift. A Youtube video showcases the roaster in action on my back porch. However, a chafe catcher was not yet installed at this point, resulting in outdoor roasting. Print Settings: Printer: ANet A8 Rafts: No Supports: Yes Resolution: 0.2 Infill: 20% Notes: This is PLA, and since it's not directly exposed to the heat of the roaster, it should be safe.