Hi Mike, Here's my latest. Plan was to not glue sheets together to allow easier mods. Sheets are gripped in place with corner wedges; no holes in sheets. Each 5 sided cover becomes a single unit and just slips into place. Corner pieces are single prints, no support. Working on stand alone Arduino Nano temp controller with color LCD screen ($5). Handful of DS18B20 temp sensors on steppers and key internal points displayed on the screen with interactive set points and alarms. Added 2nd power supply in base. Shooting for 300W additional chamber heat. Charcoal filter is awesome. Closed system. Was getting ready to give up on ABS because of fumes. Fan pumps thru a wire mesh screen, 1/2" of charcoal, and then another screen. The fan is definitely stalled, but enough air gets thru the filter. Haven't had to change the fish tank charcoal yet, but unit unscrews from the shell and just dump out the old. Only have filter on one side, but plan to add a 2nd for grins on the other side as well. Adjusted the knob on the stock Robo power supply to deliver 13.5V from the 12V (maybe) I had before. V^2/R gives a 26% increase bed power. Used to take forever to get to 105, now it will go beyond 120C, and heats to 105 pretty quick. Also replace the polyfuses on the Ramps board with 15A auto fuses. Lower RDSon FET like PSMN4R3-30PL (LL 4.3mohm 30V) without h.s. runs way cooler than the stock P55NFL06 to help handle the additional current. Gets more power to the bed.