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Hot end holder with 3 fans

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MOST Delta filament as guide.JPG This page was part of an MTU course MSE4777 OA and MSE4777 OB/MSE5777/EE4777/EE5777: Open-source 3-D printing

Please leave comments using the discussion tab. The course runs in the Fall semester. It is not open edit.

This project is helpful for printing polymers generated from plastic waste using a recyclebot.


The normal hot end holder just has one fan and the cooling air always blows from one side. One fan design makes the printed part cool down unevenly and there is always one side has more tendency to curve. This design improves the cooling system by redesigning the hot end holder and fixing three fans on it. Three fans are on the u, v, w sides respectively so the cooling air can be blew from three different directions and cool the printed part more consistently.

Original Author: User:Shan Zhong

Hot end holder.JPG
Hot end holder with 3 fans.JPG


This hot end holder was designed with Free CAD. It is just for Delta so it generally looks like triangular prism. The biggest difference of this design with others is the hot end brace. The hot end brace in this design is not like a semi-circle but consists of three small arcs. These three arcs is not thick so they are flexible and can provide entrance for the hot end. It is necessary to make some supporters for some parts. In this design, the magnet holders, braces and top have 0.6 mm of thickness supporters. It should be noted that the thickness of supporter should be small but larger than nozzle size. For the nozzle size of 0.5 mm, if the thickness of supporter is small than 0.5 mm, the supporter wouldn't show up; if the thickness of supporter equals 0.5 mm, just some of supporters show up, so the thickness of supporters is 0.6 mm in this design.

3 fans hot end holder-stl.PNG


  • Print Parameters Utilized
    • Layer Thickness: 0.2 mm
    • Skin Thickness: 1.5 mm
    • Top/Bottom Thickness: 1.5mm
    • Temperature: 180 C
    • Speed: 60 mm/s
    • Flow: 100%
    • Infill: 100 %



    • PLA filament
    • 3 24V fans
    • 6 magnets
    • 12 M3 socket head cap screws


    • knife
    • M6 allen wrenches**
    • grease**


  • Use knife cut out all of the supporters
  • Insert magnets into the magnet holders and use glue to fix them
  • Insert the hot end in the center of three braces and use the glue or screw to fix it

Link to the files

The file repository is located here: [1]

See Also

Open Source 3-D Printing Athena Printer Build Overview MORE Delta Mods]