Capricorn PTFE Tubing XS- Low Friction
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I've got both the XS and TL series. The supposedly smaller inner diameter of the XS series is actually slightly larger than the TL series, but I'm sure it's just a batch issue. Both the XS and TL tubing does have very high quality. Maybe because of my old PTFE tubing already has a small inner diameter, the optimal pressure advance value for me only lowered to 0.5 from 0.6.
What sort of hot end do you have, and how long is the Bowden tube? It's unusual to need as much pressure advance as 0.5 or 0.6 except when using mixing extruders.
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I've got both the XS and TL series. The supposedly smaller inner diameter of the XS series is actually slightly larger than the TL series, but I'm sure it's just a batch issue. Both the XS and TL tubing does have very high quality. Maybe because of my old PTFE tubing already has a small inner diameter, the optimal pressure advance value for me only lowered to 0.5 from 0.6.
What sort of hot end do you have, and how long is the Bowden tube? It's unusual to need as much pressure advance as 0.5 or 0.6 except when using mixing extruders.
I'm using it on a BCN3D sigma converted to duet wifi and 1.75mm e3d v6. The bowden tube is about 60cm. Maybe my way of finding out pressure advance value is wrong. I was doing a 20mm x 20mm tower in vase mode at 100mm/s speed. The problem on the corners resolves at a pressure advance value of 0.5.
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Thanks! That's a perfectly good way of finding a good pressure advance setting (but see the caveat below). The corners look quite bad with no pressure advance, but perhaps that's because you were printing quite fast, and pressure advance matters more at high printing speeds.
One thing to watch out for is that high pressure advance settings have the side effect of reducing acceleration unless the extruder jerk is set quite high, and the reduced acceleration may contribute towards the pressure advance "working".
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Thanks! That's a perfectly good way of finding a good pressure advance setting (but see the caveat below). The corners look quite bad with no pressure advance, but perhaps that's because you were printing quite fast, and pressure advance matters more at high printing speeds.
One thing to watch out for is that high pressure advance settings have the side effect of reducing acceleration unless the extruder jerk is set quite high, and the reduced acceleration may contribute towards the pressure advance "working".
Since pressure advance should work independent of speed, I purposely used a high speed for magnifying it's effect. I don't print at such high speed. My extruder acceleration is 5000mm/s and jerk is 10mm/s, whereas the X/Y acceleration is 2000mm/s and jerk is 8mm/s. I guess you are right, maybe the limited printing speed from pressure advance is contribute towards the pressure advance "working". I should re-run the test with lower X/Y jerk and higher E jerk.
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Has anybody found a UK supplier of Capricorn PTFE Tubing XS- Low Friction?
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E3D will be selling it soon.
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I bought a chunk of this when ordering my Smart Effector. I didn't measure before hand or even after cutting it to attach to my printer, but I have 150mm left of whatever the length was that I got. I am currently running some pieces at 5mm retraction (no pressure advance) and haven't seen a whiff of stringing.
Direct drive extruder flipped so the marks being left by the extruder gear are on the inside radius of the Bowden tube.
Lower retraction tests soon to come.
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E3D will be selling it soon.
Yes. I also noticed that they are including it with their "Gold Edition V6" https://e3d-online.com/v6-gold-hotend.
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Yeah E3D have it listed now in 100mm lengths. Can buy longer lengths if you increase the qty
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If anyone is planning on using the capricorn tube with a Bondtech you might want to consider using the bowden adapter rather than the built in adapter, On my bondtech the tube was frequently pushed out of the built-in bowden connector (which damages the tube) but on the adapter its perfect.
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If anyone is planning on using the capricorn tube with a Bondtech you might want to consider using the bowden adapter rather than the built in adapter, On my bondtech the tube was frequently pushed out of the built-in bowden connector (which damages the tube) but on the adapter its perfect.
I have a bondtech, can you show me what you mean?
I use this on the output end
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Another advantage of capricorn XS tube is it's rated to 340 deg c. I use it in an e3d lite6, no messing around with heat creep.
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You mean it can be used on a Lite6, and allows to reach same temperatures than the V6? That would be great!
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I would advise against that unless you can scientifically verify that to be true. Toxic fumes could be involved.
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This is from captubes.com web site https://www.captubes.com/safety.html
Seems like running it inside a hot end is not recommended, not is printing at higher temperatures.
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Plenty of hotends have PTFE going to the nozzle. I'd rather have high temperature PTFE…
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Has anyone found a UK source for the TL version? I have short Bowden tubes so would prefer to sacrifice the smaller inner diameter of the XS version for the transparency that the TL version offers. I once had something go horribly wrong with one of my Diamond hot ends and had filament from one input back feeding up another. I only noticed it because I was using transparent PTFE. Plus it's easy to see at a glance that I've loaded the correct colour filament into the correct input.
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Well, I'm using regular PTFE with Lite6, and I don't go above 230°C. Looks like the Capricorn can go a little further. But OK, I won't try 300°C! 250°C is enough for a large choice of filaments.
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Another advantage of capricorn XS tube is it's rated to 340 deg c. I use it in an e3d lite6, no messing around with heat creep.
Not true! It has a rated working temperature of 260C. Please do not attempt to use it (or any other PTFE tube) over 260C!
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Another link to captube's site https://www.captubes.com/specs.html. They show the Melting Point as 300 deg C for the TL and UP TO 340 deg C for the XS version (so it'll melt somewhere below 340deg C). The melting point is a lot different than being "rated as".
