OverlapStrap Extruder Head 0.2

The first extruder head that my Dad made for me a while back had a number of pitfalls

  • It was difficult to drill a 0.5mm hole (he broke several drill bits trying to make it)
  • The resistor wasn’t a very tight fit in the aluminum block.
  • The thermistor was attached using Thermic Seal which despite being rated to 1250 °C would crumble and fall out.

So my Dad kindly offered to make a new and improved version based on some specifications and designs that we came up with together.

Rather than try to drill a 0.5mm hole I bought an already fabricated nozzle. Quite a few companies make these now specifically for reprap printing machines including Makerbot, ReprapStores, MakerGear and ReprapSource.

My Dad turned down the nozzle to a round insert that could be put directly into the aluminum heater block. The other addition was a PTFE thermistor clamp to hold the thermistor on using two m3 screws rather than glue.

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2 thoughts on “OverlapStrap Extruder Head 0.2”

  1. It worked well until I broke it. Its slightly harder to manufacture than nopheads setup but I think that keeping the heat as close to the tip as possible is a desirable feature.

    Using a ring terminal to hold the thermistor would probably work and simpler to make.

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