Introduction
There are numerous great resources for the proper use of heatset inserts. Some of our favorites will be linked here. This supplement will focus on the use of these inserts with Blackbox specifically.
Video Overview
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Insert profiles vary by application. The 2 types on the right are better suited for use in 3D printed parts. A properly sized hole is best for performance. Before printing all of the parts for your Blackbox, be sure that your XY hole compensation (also referred to as horizontal expansion) is tuned properly. (Image 1)
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Blackbox uses heatset inserts wherever possible for strong fastener torque as well as the ability to remove and reinstall the fastener as often as needed without fatiguing the plastics.
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Insert widths can vary, but the best of them use a tapered starting edge to center it with the hole being used. We recommend using the BOM to help source them.
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Each of the direct drive tools utilize a different type of insert for bowden feeder tube retention. Installation is like a threaded insert but requires more heat and a suitable driving tool. Consider removing the tip of your soldering iron and using the face of the shaft to install them. (Image 2)
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Special tools exist for assisting in installation. They replace the soldering tip with properly sized brass driving pins. (Image 3)
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This assembly guide (along with the BOM) identifies inserts using the pictured format. Where applicable, the width of the suggested insert is also referenced. Example: M3x4x5mm
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All inserts used are of “standard” thread pitch noted here: M3x0.5 M4x0.7 M5x0.8
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Insert widths can vary, but the best of them use a tapered starting edge to center it with the hole being used. We recommend using the BOM to help source them.
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Courtesy of Stefan of CNCkitchen (CNCkitchen.com). A look at the performance of some of the different inserts available.
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Lulzbot has a page here documenting some installation tips.
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Hackaday also sheds some light on the process here.
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