No-Flange Cap for Prusament Desiccant Container With or Without Hygrometer

This is a modified version of @Sknown's remixed cap for @4nthonylin's desiccant container for Prusament spools. I liked that @Sknown's cap didn't have the flange, so you could insert the container into the spool without having to take the cap off, and easily remove it to put the spool onto the printer. But, I wanted a version that would work with the hygrometer. I also wanted to try it with a clear grille.

This model has a couple of modified features compared to the originals:

1. The grille is a separate body. If you use the 3MF file, you can choose to print with or without the grille. Without the grille, you can use the hygrometer. (STL files are provided with and without the grille as well.)
2. If you use the 3MF file and print with the grille on a multi-material printer, you can assign a different material to the grille. I'm using clear PETG, which makes it easier to see the color-changing desiccant.
3. I also slimmed the grille down compared to @Sknown's grille, which makes the desiccant easier to see. It's comparable in thickness to the grille in the bottom of the original container. (See the photo of the two PolyDryer boxes for a comparison of desiccant visibility between the thinner grille printed in clear and the original.)
4. The locking channels are shorter (60° instead of 90° to fully locked). In the originals, when you were putting the cap on with the notches aligned with the nubs on the container, the little tabs that hold the hygrometer could drop into the channel and make it hard to get the cap on. The shorter channels never overlap those tabs. There is a detent at the end of the channel so that the cap positively locks (as in 4nthonylin's original).

Printing:

If you don't care to do multi-material, you can choose whichever STL file you prefer. If you want to try printing the grille in a different color, open the 3MF file, and when PrusaSlicer asks if it should be loaded as a single object having multiple parts, say yes. You can then choose materials for the two pieces separately.

I have been printing these from Prusament PETG. The ones in the photo are the Clear and Anthracite Gray. I've been using the 0.2mm Structural preset with 15% infill. (There is almost no infill anyway.) I slowed the first layer speed down to 20mm/s which I think might help keep the PETG as clear as possible. Other settings are default.

1. The grille has been made thinner, which allows better view of color-changing desiccant.
2. The grille is a separate body, so you can print it in a different material (e.g., clear) if desired.
3. The cap can also be printed without the grille, in which case it works with a hygrometer as in the original model by @4nthonylin, but because @Sknown's model doesn't have the flange, the container can be inserted into the spool without removing the cap.
4. Modified the locking channel to allow less rotation. The original locking channel overlapped the hygrometer-holding tabs on the desiccant container when putting the cap on, and that could make the cap bind up. The shorter channel never overlaps the tabs.

Additional differences added in v2 29-Aug-2024

1. Revised the geometry of the twist-lock channels to allow smoother turning.
2. Enlarged the chamfer on the inner circumference of the ring. The lid can be spun more smoothly while riding against the container’s locking nubs until the locking channels align and the lid drops into place. (This more closely matches @4nthonylin’s original.)
3. Added small triangular markers on the outer face of the lid to aid in aligning the lid with the locking nubs on the container.
4. Added detents in the locking channels so that the lid has a positive closure when rotated fully. (This more closely matches the original.)
5. Fixed a missing chamfer on one of the two latching channels.