HO Scale C & O Railway Standard Linemens Tool House - Designed to print only in White Strong & Flexible. Due to minimum Walls one should expect to have to place backing against the inside walls to correct the flexing of the walls to square the structure. Printing results in White Strong & Flexible unknown as this model has not yet been printed. Printing should be considered experimental in WSF. Printing on the same structure in Frosted Detail or Frosted Ultra Detail is recommended.