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Need a replacement for my 3D printhead?

Hi Guys,

I have run into an issue which I'm not sure I've diagnosed correctly:

This started happening after many successful prints.

Intermittently; its as if there is a blockage in the head or tube while printing(this does not happen continuously) - where the feeder slips and the feeding tube bounces. Sounds weird I know but I didn't change any settings from previous prints, same head temp etc. (I'm not sure if the stepper is slipping or the filament drive gear is slipping)

Then I measured the head temp manually (on the outside) and I got a reading of 128 Celsius and it was set to 230 on the interface. Probably is hotter inside but I'm thinking this could be the issue.

(this also happens when I lower the bed , heat the printhead manually and extrude some filament)

So is the printhead caput?

If so how do I order a replacement?

Answered! View the answer I have this problem too

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At anytime you can request to purchase a replacement by sending an email to Hadley@BoXZY.com.

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This head looks like a close match to what I have seen in the 3D printer module.

Let me know if there is a closer fit!

https://folgertech.com/products/bowden-j...

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That's the right replacement. One small warning about those; They do not clean the inside of the nozzle well after machining. Make sure you have taken it apart and cleaned out any machining debris or lubricant before installing it, and use a lot of teflon tape on the threads during re-assembly. Otherwise they are a great replacement.

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Thanks for the warning! Nothing like having the Customer do QA!

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When it comes to cleaning a new print head, what do use to clean it? isopropyl alcohol? Little tiny wire?

Thanks!

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Personally I use dish soap and some computer duster (air pressure). A brushed dental pic would help if anything is really stuck in there (unlikely). Since they're new there is no plastic to worry about, it's just about making sure there isn't any debris or oils/chemicals still hanging around.

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Thanks again! Take care!

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First thing to look for is a tangle in the filament spool (some of the most seasoned users missed this issue). The filament can also get really twisted in the filament tube creating extreme resistance. Try removing it entirely and reinstalling it after straightening it.

After the really basic stuff we want to verify the filament drive isn't the issue. Make sure to clean the filament drive knurled gear really well, then remove the clear tube and extrude filament straight into the air from the manual control window. Start with the filament already past the top. Verify its driving the filament cleanly and with reasonable force.

Reassemble everything. After that if you haven't seen a clogged gear or other concerns, you either have a temperature issue or a clogged nozzle. Visually check that the thermistor is fully installed in the aluminum block. Turn your fan to 15% and the heater to 270C. As it approaches 270C start trying to extrude as much material as possible. Don't let it just sit at such a high temperature without the fan running and without filament actively extruding or you can create a clog. Extrude for about one minute and then continue extruding as you reduce the temperature to your normal temperature.

Let me know if the issue continues after that. Next step will be to push a guitar string into the nozzle when hot and while extruding preferably. Gloves are recommended to avoid burns. You can do this with the head outside of the clamp.

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Hi, Thx for assisting! tried as suggested but head is not getting warmer than 144 celcius when measured from outside. It extrudes ok when slow extrusion but as soon as Im using the higher speed (using manual extrusion on interface) the problem comes back

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@JustHelping - Is the Boxzy print head a 24V or 12V heater (5V under or 7V over)?

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Hi Gary, It's a 12V 40 Watt cartridge. The power draw is controlled through PWM.

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Ah okay! Thanks!

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Andre,

If the head is bad, here is a replacement: https://smile.amazon.com/gp/product/B00X...

Ken

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Andre will be eternally grateful.
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