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M3 Heat Insert Tolerance Calibration Test — image 1
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M3 Heat Insert Tolerance Calibration Test

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I didn't find a tolerance test here so I created one its a Wip and your mileage may vary so I included step files

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Test Models
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Edited:-

Inverted numbers as they can interfere with inserting inserts.

M3 Heat Insert tolerance calibration test,

Heat inserts I have are cheap amazon special measuring 4 mm diameter by 5 mm deep.

https://amzn.eu/d/02rNTRFA

For me in this example 4.1mm diameter with chamfer makes insertion and keeping a straight angle the best compromise between too loose and too tight (  the snug 3.9 will more likely lead to the insert being forced in at an angle, the 4.2 would give a straight insert but leaves less plastic for the insert to grip).

Useful to gauge if your holes need resizing or if your extrusion needs adjusting, Im sure there are better ways of doing this ??

Any guidance greatly appreciated. 

Thanks