E3D : 3/1.75 mm

Hi,

I was looking for info on E3D hotend hardware.
Looking at the drawings (http://wiki.e3d-online.com/wiki/E3D-v6_Documentation) -scroll down to see PDF files- you'll see that the hole in the cooling body(sink) for a 3mm filament is 3.2 mm in diameter(like it should)
Looking at the drawing of the sink for 1.75mm filament the guiding-hole in that part is 4.2mm in diameter. Why is that...? Shouldn't that hole not be 2mm instead of 4.2mm. Is there an error in that drawing or Im I missing something here...?

Chris

Edited 1 time(s). Last edit at 09/16/2016 06:51AM by chriske.

think that 4.2 mm hole is so they can put a PTFE liner inside it

---

If you need some help, or don't understand what I just said, feel free to send me a PM anytime

Printer: Prusa i3, 2 E3D v6 Hotends, Arduino + RAMPS 1.4 with a Bypassed 5V Regulator, 400w Insignia ATX PSU, Custom Designed Bowden Extruders

On the Performance version the 4.2 is for the PTFE tube, it only goes in as far as the top of the threaded heat-break.

Thanks,
But why not drill all the way trough the sink diameter 2mm instead of using a PTFE guiding tube in that sink...?

Chris

1.75mm filament is more flexible than 3mm so it's harder to apply as much force to it. On the flip side it has a larger surface area to volume ratio, so it's more prone to friction in the feed path. PTFE is very low friction, so using ptfe helps, and the help is more important with smaller diameter filament. You can use an unlined 2mm bore with 1.75mm filament, I have one of my hotends setup that way for high temperature filaments. PTFE is most useful for printing PLA which has particularly high friction once it gets warm, and also melts at low enough temperatures that the PTFE is unlikely to degrade.

If you want to use all metal hot ends with PLA, you need a ton of torque, the PLA gets warm and sticks to the metal easily. PTFE limits max temps but avoids jams

---

If you need some help, or don't understand what I just said, feel free to send me a PM anytime

Printer: Prusa i3, 2 E3D v6 Hotends, Arduino + RAMPS 1.4 with a Bypassed 5V Regulator, 400w Insignia ATX PSU, Custom Designed Bowden Extruders