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Fan duct too low

Posted by Ciaran_T

Ciaran_T

Fan duct too low
January 30, 2014 06:26PM

Registered: 10 years ago
Posts: 4

The fan duct on the hot end of my printer sits too low and is almost the same hight as my extruder nozzle. It therefore sometimes drags along the top of the parts that I print and sometimes ruins them. I assembled the hot end exactly as explained in the ormerod documentation.

Is there a way to fix this problem?

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PaulHam

Re: Fan duct too low
January 30, 2014 06:34PM

Registered: 10 years ago
Posts: 147

Sagging x carriage. I have the same.

Widen the slot for the bearing on the right side, and get a 10mm bearing instead.

I still need to widen the slot some more but the bearing helped a lot

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Ciaran_T

Re: Fan duct too low
January 30, 2014 07:06PM

Registered: 10 years ago
Posts: 4

Thanks for the suggestion PaulHam. I've shifted the position of that bearing and that seems to help a bit with the sagging. Also, I think I'll but some tape around that bearing to increase its diameter as a temporary fix until I get a larger diameter bearing as you've suggested.

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Treth

Re: Fan duct too low
January 31, 2014 02:38AM

Registered: 10 years ago
Posts: 314

I had a similar problem which I described as the extruder nozzle not low enough, so tackled from that perspective. My solution is to place 2 or 3 washers between the extruder metal mounting block and the heat insulator strip. This has worked well and I believe also provides an extra bit of insulation by introducing an air gap.

Ormerod #007 (shaken but not stirred!)

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dc42

Re: Fan duct too low
January 31, 2014 04:26AM

Registered: 10 years ago
Posts: 14,672

See items 4a and 4b in [forums.reprap.org].

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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Squags

Re: Fan duct too low
January 31, 2014 06:34AM

Registered: 10 years ago
Posts: 48

I've just modified the x carriage, which should sort this problem for you. Have a look here: [forums.reprap.org] for details

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badman.teddy.edward

Re: Fan duct too low
February 01, 2014 07:07AM

Registered: 10 years ago
Posts: 32

Quote
Treth
I had a similar problem which I described as the extruder nozzle not low enough, so tackled from that perspective. My solution is to place 2 or 3 washers between the extruder metal mounting block and the heat insulator strip. This has worked well and I believe also provides an extra bit of insulation by introducing an air gap.

I did the above too and widened the hole for the fixing, I used PTFE strip not washers. Worked really well.
Surprising that second generation machines still have this issue.