Lens cap for X300

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Tired of your X300 lens getting all sooty after shooting? Always forget your chapstick that you were going to apply first? Throw this lens protector in your range bag and you will never have to worry about scrubbing soot off your X300 again!

This lens cap for the Surefire X300 will slide over the main body of the lens and then lock in place so it won't come off during shooting. It's definitely a tight fit the first few times off and on, but it will loosen slightly after about three cycles and then it's a breeze to put on and remove. Don't cant it as you try to install, try to go straight on and off.

PLA+ or PETG are recommended. I suspect a regular PLA may fail in the interference tab during installation or from the concussion during use, so I'd recommend sticking with the more durable materials for this part.

I have two versions up currently, vA and vB. vB will be a slightly tighter fit than vA. I recommend starting with vB and if that is too tight to get on then scaling back to vA.

Recommended print settings:

PLA+ or PETG

0.4mm nozzle

0.2mm layer height

Wall Loops: 5

Bottom Shell Layers: 6

I also have a version for the TLR-1! https://makerworld.com/en/models/2740787-lens-cap-for-tlr-1#profileId-3039217

Many thanks to @user_851306867 (Alor) for requesting this model be made and helping me confirm fit through the prototyping phase! He also provided the base images that I used to make the listing photos.

Change Log:

6/18/26: Add a vB that is a little tighter fit than vA.

6/14/26: @user_851306867 (Alor) has confirmed that v3.3 is the perfect fit! He also provided pictures to use for the listing. I have rev'd to A and we are now out of Beta. Thanks Alor!

6/7/26:

Four new versions based on 3.2 uploaded with progressive tightness based on feedback from Wreck3M

3.2.1: 0.3mm tighter than prior with an ID of 30mm. (Based on feedback scaling, tried to directly copy)

3.3: 0.5mm tighter than prior with an ID of 29.8mm

3.4: 0.75 mm tighter than prior with an ID of 29.55mm.

3.5: 1mm tighter than prior with an ID of 29.3mm.

I need some help test printing to see which of these works best! I would recommend starting with the loosest two (3.2.1 and 3.3) and then work tighter if you are filament limited. Or try all of them if you have some thread to spare. I think one of these will be the winner because there is not much more room to go to make them any tighter.

6/5/26:

Updated v3.2 uploaded. Save as v3, but with 0.5mm reduction in the interior radius. Need a test print done to confirm fit.

The printing artifact in previous versions was some sort of STEP conversion issue. I could see it in the slicer when saved as STEP. In STL format no issues and that is what the new 3.2 is saved as.

5/30/26:

Alor has printed all current CAD and identified v3 as the most promising. All exhibit a weird printing artifact near the bottom that needs to get worked as it looks like some sort of rendering glitch in the model. I should be able to get a new version up the week of June 8th. In the meantime no new testing prints need to be done.
5/27/26:

Feedback provided by Alor that v1 was about 2mm short and fit a bit loose.

4 new versions have been updated to check various configurations.

v2: Same Inner Diameter as v1, overall 2mm longer

v3: 0.5mm smaller Inner Diameter, overall 2mm longer

v4: 0.5mm smaller Inner Diameter, overall 2.5mm longer

v5: Same Inner Diameter as v1, overall 2.5mm longer

Alor you had the better feel for the v1 so I will let you guess which one you think will work the best and then you can pivot from there (or print them all to save time but I don't want to waste your material if I don't need to).

From what you described I would probably start with v2 and v3 and then see if v4 or v5 is necessary. 

5/23/26:

By request of @user_851306867 (Alor) I have modified my TLR-1 cap to dimensions more in line with the X300.

This has not been tested on an X300 (too poor), but if you had the pockets for the X300 and are willing to test and confirm the fit I would greatly appreciate it and we can get this out of Beta!