There’s nothing like an honest opinion regarding products, from a company that has the experience to put forth valued and educated opinions. Recently, SD3D reviewed four unique, flexible filaments: PCTPE from taulman 3d, FlexSolid from MadeSolid, NinjaFlex by Ninjatek, and Cheetah by NinjaTek. While PCTPE and FlexSolid came in with flying colors, and were hailed as filaments that SD3D often uses, Cheetah is not actually yet released so we are all left in the dark on some issues like price, color, and printing was touch and go as they tried to figure out the best temperatures and speeds. NinjaFlex, while it has some positive points, ended up having enough negative ones that SD3D is not offering it for sale to their customers. Read more at 3DPrint.com: http://3dprint.com/123908/flexible-3...ing-filaments/