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garethky / Slice-Mosquito-Direct-Tool-Head

Models and Instructions for making a Mosquito/Bondtech direct drive toolhead for the E3D Tool Changer platform

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40mm fan duct is warping

garethky opened this issue · comments

commented

IMG_5974

Tests of the 40mm hot end fan duct have shown that it warps or twists upwards over time. Some likely causes of this issue:

  • There is not enough plastic around the screws to resist warping
  • The shroud overall is not very thick or rigid

Adding more material around the mounting bolts would disturb the airflow further. One alternative is flipping the fan mounting such that the bolts go into it from the back of the mosquito. We can use some 2.5mm melt in inserts in the duct.

Switching to a loft for hollowing out the duct would also allow for an 'S' curve shape providing more plastic around the mounting points

Finally removing some material from the extruder back plate would allow the duct to be fully symetrical, allow it to have thicker sides and allow it to print without supports.

commented

This looks to be resolved based on testing with the new parts in the dev branch.