First post here! I am a screenprinter who also enjoys tinkering with my Riso machine for fun. Anyways, I also have a Savin 3180DNP duplicator with 3 "type 20" Drums- Black, Red, and Blue. I have been able to find Black ink online but wasn't sure where to look for red and blue or if ink for other models was compatible. Also considering selling this machine since I hardly ever use it. Any one have tips on where to sell aside from ebay? Thank you!