RBJ magnetic cooling system

Summary

This is a simple magnetic cooling system which makes cleanup and accessing the hot end extremely easy. It uses 8 neodymium magnet for an old BLDC motor. They can hold 700gm-800gm easily, which is more than enough for this setup. We connect all the electronics using JST HX connectors. There are 2 5015 blower fans for the part cooling, we can set them to 50-60% speed, making the machine quieter and not losing any cooling.

Note: This design is for the stock ender 3, ender 3 V2 plate and other similar printers with stock hot end. 

Update 15-5-2022

1. Added base plate for ender3 V2 (needs testing)
2. Added led bar without threaded inserts 

Part list

1. 12mmx4mmx1.5mm magnets *8
2. 5015 blower fan *2 
3. 4040 fan *1 (stock)
4. M3 10mm button head screw * 8
5. M3 5mm countersunk screw * 2
6. M4 20mm screw and nut * 2
7. 2 pin male and female JST XHP-2 connector * 1 (optional)
8. 4 pin male and female JST XHP-4 connector * 1
9. M3 3mm threaded inserts * 12 (can be done with using 7)
10. Wire 
11. Super glue 
12. Led light (this is optional as I have made my own using 6 5050 LEDs connected in series on a general purpose PCB)

Optional

1. JST XHP-2 connector male and female
2. Led light

Print instructions 

I have shown the print orientation for all the parts in the photos.

Material : PETG/ ABS

Layer height: 0.2mm

Infill: 15% 

Wall count: 3 or 4

Print speed 60mm/s

Supports: enabled (support on build plate only)

Plans for V2

1. Replacing the JST connector with some other contact type connector like pogo pins
2. More accessible duct height adjustment
3. Alignment pins
4. Adding support for other hot ends

download the PDF for detailed build instructions with photos.

Also check my other project https://www.printables.com/model/118905-macropad-for-photoshop

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I also do freelance work email: [email protected]