RatRoaster Active Heater - Angled Outlet Grill for RatRig V-Core4 and other printers

The RatRoaster is an excellent active chamber heater design that works great in a V-Core4, and likely any other printer with a 3030 extrusion.  

This new grill is intended as a humble improvement to better direct the hot air out of the RatRoaster.  

The original design does not direct the airflow discharged from the heater.  Hot air blows directly out of the heater towards the opposite wall as shown in the illustration.  In my case, that's a PC panel which is getting too hot. Since mine is mounted on the rear of the right side panel, it blows directly across to the rear of the left side panel. This also does not optimize the hot air circulation within the chamber. That makes getting the entire chamber up to temp take a bit longer than need be.

By angling the air towards the diagonal opposite corner (left front corner in my case) the entire chamber heats up more uniformly and more quickly. 

This grill is designed an add-on that fits over the original heater grill. 

Printing - Print it flat side down, no supports, at least 30-35% infill.

BOM - (4) Screws - replace the original grill screws with ones that are 3mm longer…this installs over the original grill.

Material - my RatRoaster is printed entirely in PPS-CF for thermal resistance. Likewise, my grill is also printed in matching PPS-CF.  One should use a seriously heat-resistant filament for the RatRoaster and this add-on air deflector.

Results - VC4-400 with 4mm ACM rear panel, 4mm PC side, top, front panels: 

With the recommended PTC and blower, after sending the print, the entire chamber reaches target 55C by the time bed  is heated, mesh leveling is done, and the extruders are hot and ready to start printing. That's 5 minutes on my VC4-400. It obviously takes a bit longer for higher temps, but still quite quick.  >70C is not a problem, but intentionally limited with my PC panels at present.