When I look this up, it's related to removing the cooling tube position in Prusa. Chris's Basement says to do it. What should I have in there?
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Invalid speed in 'G1 F-2147483648' when printing purge tower
Invalid speed in 'G1 F-2147483648' when printing purge tower
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Check your slicer settings, this is a known issue. You can add a GCode Substitution block to your slicer's Print Settings | Output Options to replace that code with a ;G1 in front of it, that way your printer will ignore it.
Also, make sure all four of your extruder settings are identical in your slicer... if they're different, it can cause this to be injected.
I don't know where you're getting the cooling tube position setting from, but there are several reasons for that code to be generated... the 100% sure way of fixing it is the substitution that simply comments out that line with the semi-colon. That way you aren't forced to make any other setting changes you don't want to.
Bill