GrabCAD Print wrecking print trays

I recently started using GrabCAD Print software to run our Fortis 250mc printer, it seemed to setup very easily and the prints come out ok.

Although the problem is the software is adding an extra first layer of ABS plastic before it starts printing the soluble support material. This melts into the tray permanently which essentially wrecks it, as its impossible to remove.

Our older Fortis printer when used with the Catalyst software prints support first, so we can re-use a tray a few times before its scrap.

Can't seem to find the settings to get rid of this and it seems like a bug. Anyone else have this problem?

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3 Answers

Hi Chris-

Sorry to hear you're having some frustration. The behavior you're seeing is not a bug, and is just the way that the Fortus 250mc is designed to work. The legacy software for this printer, Insight and Control Center, work in the same way, since they share the same core process for build processing with GrabCAD Print. With the latest GrabCAD Print update, version 1.11, you will notice that calibration touchpoints are shown on the tray. If you avoid printing in these areas, the tray will not be rejected by the printer if you try to reuse it, but please keep in mind that the trays are a consumable. A failed print can be more costly than a new tray. If you have any more feedback or concerns about GrabCAD Print please feel free to reach out to me directly at


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Hi Chris, FDM support engineer here. The purpose of this layer is to anchor the part and prevent heat-induced warping, which is a bigger problem for parts that have a large cross-sectional area. Unfortunately this is the side the effect, but as Danny mentioned we've optimized for reliability over cost.

For our test prints we use a chisel to scrape the material off, though I usually work with ASA, so I'm not sure if that would work for you

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Hi Folks, I appreciate the responses. At least we know its not a bug, but as a feature it doesn't seem well thought out at all.

For example if I print a tiny part on a fresh new tray and it happens to land on one of the touch off points that the printer uses for calibration of the Z flatness, then the calibration will fail and the tray is rendered scrap.

So this requires the user to remember where prints were made previously and guess where not to put a new part on a used tray.

This feature of laying down ABS first seems poorly thought through, if the calibration was done OFF tray and wouldn't hit any remaining plastic it would make things easier, and if the software showed a ghosted image of previous prints so placing new parts on an old tray would be trivial.

As it is now it looks like a half baked idea to force users to consume more trays and at the same time inconvenience them by spending more time and effort to use the printer.

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