Re: 3D printing (Was: New early P&R steel.....)

Ryan Mendell

Dennis good point you brought up about the grit blasting. I do grit blast all my 3D printed parts or sand flat areas of parts with the sanders I sell trough National Scale Car. I developed the sanders specifically for this purpose.

Even surfaces that don’t have wax still have lines on them. These lines are left by the roller and knife of the jet printing head. The roller and knife need to be serviced at least a couple times a year to keep them in top condition. This is done by a 3D Systems technician that we have to pay and come in to do it. It’s not cheap, they charge upwards of $2000 a day for servicing the machine plus parts.

Another source of part quality is shrinkage. This can be controlled with axis print compensation. Basically an offset put into the printer setup to correct for part shrinkage in x , y and z. But if parts are printed on different printers the compensation might be a bit off between them and parts could come out different lengths. This may have been the case with the girders in one of the previous posts. Also the longer the part the more possibility of length discrepancy do to shrinkage.

Ryan Mendell

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