Best way to print hollow cylindrical items

[RomeFallsAgain]

I'm printing a series of cylindrical hollow tube like structures. In a way, it resembles the olympic rings but in a circle.

Imagine 5, 30mm (1.5in) diameter hollow cylinders, 70mm(4in) tall and with 2.5mm(3/16in) thick walls in a circle touching one another slightly.

It takes an awfully long time to print this even on FAST setting.

Would the Vase setting help with this?

Is there a technique I could try that might speed up this print?

Thanks

[CompoundCarl]

If the rings are pretty thin, then it's probably slowing down to make sure you have enough time to cool each layer. So changing the "adjust printing speed for layers below XX sec" settings on the Cooling tab can help speed it up (but may cause the print quality to be worse)

[RomeFallsAgain]

Hi Compound,
I tried changing from 15 seconds to 5 seconds. Print time did not change

[CompoundCarl]

Well then I will stop guessing and maybe you can post your factory file

[RomeFallsAgain]

Thanks for your help.

After trying a number of changes to various parameters I concluded there really is no way to print this any faster.

[kabali16]

Thanks for your help.

After trying a number of changes to various parameters I concluded there really is no way to print this any faster.

I am guessing it is slow because of the outline underspeed (Other tab), which is usually 50% of the default printing speed. If your part only has outlines it is likely to print at this speed. You can set this to 100% if you wish.

[RomeFallsAgain]

Thanks for your help.

After trying a number of changes to various parameters I concluded there really is no way to print this any faster.

I am guessing it is slow because of the outline underspeed (Other tab), which is usually 50% of the default printing speed. If your part only has outlines it is likely to print at this speed. You can set this to 100% if you wish.

Turns out you are right. I had this set at 20% and the circles are almost nothing but outline. Raising this to 50% cut the print time to less than half what it was at 20%.

The question now becomes will it print the cylinders with good quality at a higher speed?

We shall see.

Thanks!

[RomeFallsAgain]

One other thing that would really speed this up is if instead of printing squiggly infill, the walls of the cylinders (which are about 2.4mm thick) where simply all outline.

I've tried increasing he outline size but it still seems to force a tiny bit of infill.

Do you know any way to print thin (2.5mm) walls of a cylinder without the squiggle infill? (just lines like outline) ?

Thanks!

[dkightley]

One way would be to set a manual extrusion width that will give a multiple of 2 widths in the 2.4mm.....e.g. 0.4mm gives six widths....and set the number of perimeters to half the number of widths.....in the case of this example, 3. Then tweak the perimeter overlap value to get the desired number of perimeters an no infill.

[Johnm]

I am using Simplify3d v5.02. All I can say is WOW!!!! I just printed about 50mm or 100mm or so of a round tube at your recommended 1mm Layer Width in Vase mode. Man My best print to date by far. Thank You. I worked so hard to get to this point. I printed at .6mm nozzle, .4mm layer height. I am using the REVO hotend and I have to print at 245c for PLA and a Multiplier of 1.10 to get good prints otherwise I will get under extrusion issues and the layers will not stick together. I upped the prints flow rate during printing to 120%. Defiantly NO OVER extrusion issues. Nice small layer lines. I can flex the print almost all the way to flat, as far as I tested and no way to tear this tube apart. I am using MatterHacker Build Series PLA. 50% fan speed, 70 or 80mm/s Speed. Part of the top of the print did not print but I think I just designed it wrong for printing in vase mode. I hope the rest of my prints come out this good.