Poster Tube - Lock Rings (New Files!)

## Part Selection:

Use the tables below to select the correct parts to construct your carrying tube.

You may wish to print lock rings to secure them; if you're using PETG, you should print both the 20mm and 40mm stretch versions to see which best fits your needs, and if it's too stiff, use a lower-stretch model - different plastics and printing processes will result in different degrees of stiffness and locking force. 

You will need one less lock ring than the number of segments you print. You may optionally apply some tape to the joints, preferably with lock rings, to prevent them from coming undone while travelling.

If you don't mind the lugs, you could alternatively print the hooked version, which you can then use a piece of string (or maybe an O-ring - 20mm x 3.5 works well) to keep from unfastening. This stops the lock rings rotating and rattling, and makes it very difficult for the two sections to telescope downwards together. For more permanent assembly, you could also try using the zip tie variant - for instance, on the bottom joints, with an o-ring on the cap.

Note that the tubes telescope by 5mm at each connection when joining or removing segments - you will need to make sure that you allow 5mm of additional length to allow the tube to open and close, and bare in mind that the whole assembly may telescope down by 5mm at each joint if the tube is squashed along its axis. You should therefore either use lock rings (preferably with hooks) or chose a length that will be longer than your intended contents by at least this much to prevent them from becoming weight-bearing components.

The minimum internal diameter of the tube is 73mm.

## Print Orientation:
The lock rings should be printed with the widest part flat on the bed

## Print Settings:
This was designed for printing in PETG on a printer capable of 0.5mm line width (e.g. with a 0.4mm nozzle). If using PETG, you should aim for the best possible layer adhesion and strength by selecting a print temperature near the top of your filament and printer's temperature range, with minimal fans.

If you're using some other plastic, I guess you'll have to work it out.

The following slicing parameters are advised:

### Main process:
 Region: 0.0 to 2.5mm
 Perimeters: 2
 Bottom Layers: 3
 Top Layers: 3
 Infill: 20 - 40% Hex
 Additions: Raft