J-head Assembly:MOST

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Tandem Build MOST Delta Navigation
Green indicate workshop tasks
Printer Primer
Soldering and tinning
Assembling hot end
Drilling Pilot Holes
Person 1 Person 2
Tie Rods and Pulleys Epoxying Magnets
Motor End Assembly Idler End Assembly
Extruder Drive Mount Bases
End Effector Frame
Printing Basics
  1. Smear muffler cement on heating resistor.
    Insert resistor and bend leads.
    Smear a small amount of muffler cement around the entire exterior of the heating resistor and insert into the hole provided for it in the hot end. Carefully bend the resistor leads up towards the top of the hot end heat sink.
  2. Insert thermistor with muffler cement on it.
    Apply a small amount of muffler cement to the glass bulb of the thermistor and press into the hole in the hot end. Use a toothpick or similar item to clean away any excess cement on the exterior of the hot end. Set the hot end aside to let the cement cure.
  3. Carefully check to see that the muffler cement has set around the hot end thermistor and power resistor. If it has, carefully slide on the teflon tubing provided for the thermistor and resistor leads. Each lead should be insulated by a teflon tube.
  4. Butt join the tinned lamp cord {Soldering_and_Tinning:MOST} to the heating resistor leads.
  5. Butt join a 1m length of copper pair {Soldering_and_Tinning:MOST} to the thermistor leads.
  6. Carefully bend the leads around the hot end such that both the power resistor and thermistor conductors are located at roughly the same point at the top of the hot end. Carefully and tightly wrap kaptan tape around the bottom of the heat sink near the nozzle, making at least three complete turns around the heat sink. Do not wrap tape such that the openings in the heat sink are blocked or cooling of the hot end entry point will be impaired.
  7. Strip about 3mm (1/8”) of insulation from the ends of the 40mm fan leads and carefully twist the ends of the exposed conductors. Dip in solder flux and tin the conductors with hot solder.
  8. Cut two 12mm (1/2”) lengths of 3mm (1/8”) heat shrink tubing and slide over the one set of ends of the remaining twisted pair.
  9. Butt join with solder the twisted pair to the fan leads. Slide the heat shrink tubing over the joint and shrink in place.