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Prober Mods 3mm out of 1.75 parts

Posted: Wed Apr 11, 2012 8:53 pm
by Prober
I posted a while back about using the standard 1.75 mm to run 3mm plastic.

This is it and it works.
The major change is taking the PTFE tube out. The hole sizes are standard sizes used by MakerGear on their fine head. Much of my MG experience was placed into this Mod.

Note: this is only used for ABS

I'm talking to Steve to incorporate some of the ideas that would make the quality even greater.

Re: Prober Mods 3mm out of 1.75 parts

Posted: Wed Apr 11, 2012 9:11 pm
by Chris Muncy
So there is no Teflon tube in the center??

Re: Prober Mods 3mm out of 1.75 parts

Posted: Wed Apr 11, 2012 11:17 pm
by Prober
Chris Muncy wrote:So there is no Teflon tube in the center??


None

For ABS I've found more problems with the Teflon then its worth.

Re: Prober Mods 3mm out of 1.75 parts

Posted: Thu Apr 12, 2012 10:00 am
by michaellatif
Prober wrote:
Chris Muncy wrote:So there is no Teflon tube in the center??


None

For ABS I've found more problems with the Teflon then its worth.

Huh, interesting. I would like to see a larger write up and more pictures on this please.

Re: Prober Mods 3mm out of 1.75 parts

Posted: Thu Apr 12, 2012 3:35 pm
by Prober
michaellatif wrote:
Prober wrote:
Chris Muncy wrote:So there is no Teflon tube in the center??


None

For ABS I've found more problems with the Teflon then its worth.

Huh, interesting. I would like to see a larger write up and more pictures on this please.


Kinda short on time today but will give you a few basic tips to be followed later.

Mainly its about cold, warm, and hot zones.

1) Cold = area above where the filament enters the "hot end" (near the feed rollers)
Tip: atm for testing I have cut the tube down to about 4mm above the plate.
A dremel was used to widen the lip a bit (help with feed)

2) Warm = area in pic with black insulation. We want any heat to be trapped and used within this area and below.

3) Hot = zone inside the hot end where the real melting is done.

had to change from the 1st generation (2 parts) to the second one part due to leaks. Its and easy fix that Steve has the info on.

If you have questions please list them, it will help me do a proper write up.

Re: Prober Mods 3mm out of 1.75 parts

Posted: Fri Apr 13, 2012 11:42 am
by Prober
Chris Muncy wrote:So there is no Teflon tube in the center??

More background: This is where the concept of a solid PEEK comes from:

http://www.makergear.com/pages/superpack-instructions

Re: Prober Mods 3mm out of 1.75 parts

Posted: Mon Apr 16, 2012 2:51 pm
by Prober
UPDATE

I'm putting this project on hold for a while as I experienced my first failure with it working.

The problem is a balance of heat and pressure. The tests above worked with one resistor heating, but not well enough on 3mm plastic.

My failure was caused by adding the second resistor for heating. It fixed one problem and caused another, that being the peek slipping out of the metal.

The fix I believe is shown in the MG pic above. The metal needs to thread into the peek.

Re: Prober Mods 3mm out of 1.75 parts

Posted: Fri Apr 20, 2012 2:20 pm
by Fastest1
IIRC the MK7 uses no PEEK or PTFE. Though it might just be no PTFE. It is only for the 1.75mm filament but what difference does that make? Now who made those tiles for the Space Shuttle? Seems like they might want to sell a few now.