Hi @travis I have the older model of that dremel and they both work about the same and even my dremel does the same thing as you described which it gets really hot really fast at times and usually this means that the air vents are clogged up with stuff and it looks like this model has the vents closer to the tip of the tool. So my solution is either take air in a can or an air compressor and blow into every opening of the tool. My second solution is replace the brushes and here is a link for how to replace them [http://www.quality-handtool-review.com/dremel-4000.html#replaceable-motor-brushes]
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Now here is a link for the replacement brushes [http://www.stewmac.com/Luthier_Tools/Types_of_Tools/Routers_and_Bits/Routers/Replacement_Motor_Brushes_for_Dremel.html?utm_source=google&utm_medium=shopping&utm_campaign=2016-03-gp&gclid=Cj0KEQiAsP-2BRCFl4Lb2NTJttEBEiQAmj2tbVHL9kuNSiLUzu-geHVH_-1Zn4eEx_LrdtJJdRawOQcaAqmp8P8HAQ] now if you do all this and your dremel still runs really hot then your cooling fan is not working right and that is something I don't know if it can be fixed or replaced.
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Now here is a link for the replacement brushes [http://www.stewmac.com/Luthier_Tools/Types_of_Tools/Routers_and_Bits/Routers/Replacement_Motor_Brushes_for_Dremel.html?utm_source=google&utm_medium=shopping&utm_campaign=2016-03-gp&gclid=Cj0KEQiAsP-2BRCFl4Lb2NTJttEBEiQAmj2tbVHL9kuNSiLUzu-geHVH_-1Zn4eEx_LrdtJJdRawOQcaAqmp8P8HAQ] now if you do all this and your dremel still runs really hot then your cooling fan is not working right and that is something I just realized can be replaced here is the link to that http://www.ereplacementparts.com/armature-p-1307110.html and here is a diagram on how to take the dremel apart http://www.ereplacementparts.com/dremel-4000-variablespeeds-rotary-tool-parts-c-15440_15456_181516.html.
Hi @travis I have the older model of that dremel and they both work about the same and even my dremel does the same thing as you described which it gets really hot really fast at times and usually this means that the air vents are clogged up with stuff and it looks like this model has the vents closer to the tip of the tool. So my solution is either take air in a can or an air compressor and blow into every opening of the tool. My second solution is replace the brushes and here is a link for how to replace them [http://www.quality-handtool-review.com/dremel-4000.html#replaceable-motor-brushes]
Now here is a link for the replacement brushes [http://www.stewmac.com/Luthier_Tools/Types_of_Tools/Routers_and_Bits/Routers/Replacement_Motor_Brushes_for_Dremel.html?utm_source=google&utm_medium=shopping&utm_campaign=2016-03-gp&gclid=Cj0KEQiAsP-2BRCFl4Lb2NTJttEBEiQAmj2tbVHL9kuNSiLUzu-geHVH_-1Zn4eEx_LrdtJJdRawOQcaAqmp8P8HAQ] now if you do all this and your dremel still runs really hot then your cooling fan is not working right and that is something I don't know if it can be fixed or replaced.