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nophead / Mendel90

A RepRap Mendel variant using sheets for the frame instead of rods
http://hydraraptor.blogspot.com/2011/12/mendel90.html
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e3D wades block, recessed flat spot #65

Closed dangasaur closed 8 years ago

dangasaur commented 8 years ago

After printing the wades block for the e3d hot end I'm seeing that the hole where the hot end is inserted into the block has a flat spot or is "keyed" yet the hot end itself has no flat spot and is perfectly round.

I feel like I'm missing something but I cannot see how this is supposed to fit together. What am I doing wrong?

nophead commented 8 years ago

It is a truncated tear drop shape to allow it to be printed without support, as are all the horizontal holes. The flat is tangential to the circle, so shouldn't prevent a cylindrical hot end going in.

dangasaur commented 8 years ago

Ah ok, that makes sense. This must have just been a bad print.

nophead commented 8 years ago

Yes if your bridges droop you might need to pare some away with knife.

dangasaur commented 8 years ago

Just in case anyone comes across this at a later date, I concluded that this particular part had a poor print quality from my supplier. I also discovered a few additional modifications needed for my e3D 1.75 universal hot end.

  1. touch up the mounting hole with a 5/8ths forstner bit
  2. drill out the filament hole with a #21 drill bit (.159") to fit the ptfe tubing
  3. countersink a 9/32nds hole in the mounting hole to provide space for the ptfe coupler

At some point I will learn SCAD and incorporate these modifications for the 2nd printer I am building.

nophead commented 8 years ago

You don't really want the gearing that Wades provides for 1.75mm filament. A direct drive extruder is better.