Please checkout detail tips and tricks for heat inserts on CNC Kitchen website linked below.
CNC Kitchen Blog Post: https://www.cnckitchen.com/blog/tipps-amp-tricks-fr-gewindeeinstze-im-3d-druck-3awey
STEP Download Link for heat inserts for CAD design.
Heat Set Inserts CAD Models (STL and STEP) - link
Heat Set Insert Poster - link
Older Files:
M3 - Standard STL STEP
M3 - Short STL STEP
M4 - Standard STL STEP
M4 - Short STL STEP
M5 - Standard STL STEP
M5 - Short STL STEP
Soldering Iron Information:

Source: https://www.cnckitchen.com/
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