Of course, I can't print it until I get my extruder unclogged and working, by which point, maybe I won't need it.  (The barrel and nozzle are soaking in acetone right now, and I also ordered a spare, so when I get back from my travels next week, I'll have either the replacement or a spare for the parts depot.)  So I can't be sure this'll fit perfectly or anything yet.

It happens to me all the time, plus sometimes when that happens the hotend gets pushed out of it slot. Still better then the original acrylic design. I may try the MK3 to avoid the hotend from slipping out during a print.

I have an idea.  In addition to beefing up the tension arm, how about adding some kind of "flap/guard" that is part of the arm but branches off to the left from the pivot point to hold the hotend in the groove?  When you open the tension arm, it would swing up and to the right out of the way.  Getting to apply the right pressure might be tricky and it might require a longer pivot screw, but I might try this if nobody beats me to it.

I originally said in here btw 605zz; I was mistaken. For reference its actually a 625Z

HOW DARE YOU BE MISTAKEN! That's not allowed! Thanks man. I think I actually ended up getting some 625zz or 624zz.

Proteus wrote:

Is there somewhere that sells these parts? Mine come out ok, except for two of the parts in which one of the holes has a very thin edge. As in, I can see through the layers. It doesn't look like it would work very well for long periods of time.

Are you having trouble printing mine? I could send you a couple if you want. All I ask is enough to buy a beer. 

No, the original. I will print yours right now!

Is there somewhere that sells these parts? Mine come out ok, except for two of the parts in which one of the holes has a very thin edge. As in, I can see through the layers. It doesn't look like it would work very well for long periods of time.

Are you having trouble printing mine? I could send you a couple if you want. All I ask is enough to buy a beer. 

I beefed mine up slightly. It was enough to make my printer like it and it feels solid now. See if it works for you.

Thanks 2n2r5, I will print a couple for backups.

It happens to me all the time, plus sometimes when that happens the hotend gets pushed out of it slot. Still better then the original acrylic design. I may try the MK3 to avoid the hotend from slipping out during a print.

wrap some tape around the top of the extruder to make the groove thicker... it makes getting it in/out firmer, but also stops it moving of its own accord.

I use kapton, but masking tape would work just as well...

tealvince wrote:

Lawsy, once again thanks for your mk4 efforts.  I want to (respectfully) offer a suggestion for a future improvement.

Today, I was printing within an acrylic enclosure in an unusually warm garage, and the extra heat was just enough to allow the tension arm to fail.  Specifically, the bottom pivot point softened up enough for the pivot screw to tear through both holes.  Luckily, I still had my acrylic tension arm around to allow me to print another mk4 tension arm, but if there is a way to beef up this pivot point, I think it would be worthwhile.

+1 to that.  I use my acrylic one too, because the MK4 arm looks weak.  I also have a spare MK4.

I beefed mine up slightly. It was enough to make my printer like it and it feels solid now. See if it works for you.

Lawsy, once again thanks for your mk4 efforts.  I want to (respectfully) offer a suggestion for a future improvement.

Today, I was printing within an acrylic enclosure in an unusually warm garage, and the extra heat was just enough to allow the tension arm to fail.  Specifically, the bottom pivot point softened up enough for the pivot screw to tear through both holes.  Luckily, I still had my acrylic tension arm around to allow me to print another mk4 tension arm, but if there is a way to beef up this pivot point, I think it would be worthwhile.

+1 to that.  I use my acrylic one too, because the MK4 arm looks weak.  I also have a spare MK4.