Remixes of HenrytheV's original and side-protection Z Rod Grease Can Focusers:

• Duplicated the bottom web on top so the parts can be used either way up.
• Added material around the tapered straw entry.
• Versions for straws measuring 2.20mm, 2.80mm and 3.34mm diameter.
• Made the parts a bit smaller & lighter.

Both versions are very effective when used gently and in combination with a tissue/rag.
Images updated with some suggestions on lead-screw lubrication.

Pro-ish tip: cut the straw down for more control - reduces bounce & wiggle.

Check out Dept_9's range of print-your-own filament reels:

• UniReel - the Rolls Royce: https://www.thingiverse.com/thing:6896875
• Easy Refill Spool - Bambu Compatible - 2x one part flange: https://www.thingiverse.com/thing:7358401
• Skeleton Spool Refill System - modular hubs and flanges: https://www.thingiverse.com/thing:7315046
• Leftover Refill Spool Flange - small push-in flanges for cardboard refills: https://www.thingiverse.com/thing:7385975
• Compact Loose Filament Spool - for loose leftovers & samples: https://www.thingiverse.com/thing:5634769
• The Bitter End not quite a reel: a secure scrap-filament hanger for Enders: https://www.thingiverse.com/thing:7413168
• Spool Ballast for AMS Rollers: https://www.thingiverse.com/thing:7320829
• Spool Ballast PRUSA version: https://www.thingiverse.com/thing:7385413

General 3D printing accessories:

• Filament Desiccant System: https://www.thingiverse.com/thing:6938476
• Stick-On Hygrometer Mount for filament storage boxes: https://www.thingiverse.com/thing:6929643
• Clip-On Spool Roller for 2020 extrusions: https://www.thingiverse.com/thing:7318417
• Early Warning Filament Low Sensor with a simple mechanical arm: https://www.thingiverse.com/thing:5761257
• Clip-On Maintenance Stands for 2020 extrusions (Ender, etc.): https://www.thingiverse.com/thing:5736229
• 8mm Overspray Shield for lubing z-screws: https://www.thingiverse.com/thing:7400493
• Wanhao i3 Spool Mount [Cocoon] for bigger reels: https://www.thingiverse.com/thing:5871827

Ender specific printing accessories:

• UniSmooth Filament Hanger quick 'n easy, smooth 'n reliable: https://www.thingiverse.com/thing:7419029
• Clip-On Spool Holder that works with Ender brackets: https://www.thingiverse.com/thing:7042254
• X-Gantry Chock Lock-Out secures extruder during maintenance: https://www.thingiverse.com/thing:7035515
• Remote Viewing Filament Swatch perfect for USB cameras/PiCam: https://www.thingiverse.com/thing:5341389
• BL Touch Cover/Mask tames the visual pollution: https://www.thingiverse.com/thing:5249031
• Minimalist QR Cover for Ender 3 v2: https://www.thingiverse.com/thing:7311447
• Filament Sherpa for Ender 3 for clean and fast filament loading: https://www.thingiverse.com/thing:7075219
• Ender 3 v2 Extruder Wiring Loom Hanger for plastic and metal extruders: https://www.thingiverse.com/thing:7034003
• BTT Smart Filament Sensor Mount 18 versions: https://www.thingiverse.com/thing:5395137
• Ender 3 v2 Dial Gauge Mount for bed levelling: https://www.thingiverse.com/thing:5213092
• Ender 3 v2 Hidden OctoPi Mount: https://www.thingiverse.com/thing:5201485

And these two Dry Box systems:

• Using the Sistema 5.5L airtight container:https://www.thingiverse.com/thing:7218437
• And the Sistema 3.5L container: https://www.thingiverse.com/thing:7349995

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No

Yes

0.20 - 0.25

PLA

Try to match the straw

As with all prints in contact with liquids, suggest upping extrusion rate by about 4%-5%. This closes or at least reduces gaps in layer lines.