J-head Assembly:MOST

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Wanted: Students to make a distributed future with solar-powered open-source 3-D printing and recycling.
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This page is part of an international project to use RepRap 3-D printing to make OSAT for sustainable development. Learn more.

Research: Open source 3-D printing of OSAT RecycleBot LCA of home recyclingGreen Distributed Recycling Ethical Filament LCA of distributed manufacturingRepRap LCA Energy and CO2 Solar-powered RepRapssolar powered recyclebot Feasibility hub Mechanical testingRepRap printing protocol: MOST‎ Lessons learnedMOST RepRap BuildMOST Prusa BuildMOST HS RepRap buildRepRap Print Server

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Assembled hot end
Hot end parts. Muffler cement not in picture.
Assembled hot end
Necessary tools.
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. Heating resistor conductor soldered on.
    Butt join the tinned lamp cord to the heating resistor leads.
  5. Kapton tape securing leads to hot end.
    To minimize the possibility of breaking the thermistor leads, first 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.
  6. Butt join a 1m length of copper pair to the thermistor leads.
Assembled hot end
Assembled hot end