Better versions can be bought here:
Online order here 網上訂購: https://forms.gle/WY96zptijme9u1da6
(只限香港地區)
所有收益撇除成本, 用作將來研究和發展更多產品, 希望能幫左更多人

UPDATE** 20 August 2020

Updated with the latest genuine Alpha Design version.

STAND WITH HK verison is still in the file package for those who wish to use that instead

UPDATE** 1 April 2020
Screw head has changed been updated: ver.4.8.3

Fixes:

• NO SUPPORT needed
• will not hit the side of some 6200 mask
• Spikes are less sharp

• Print time between 1hr - 1hr 20min

UPDATE** 22 MARCH 2020
Screw base has been updated to solve issues we had with other models other than 6100 series.

The keyless turning grip is also improved, and wavy pattern is remove and replaced by some spike.

Bad news is that, we will need to print this with support, very minor support, about 0.5mm support only.

UPDATE**
New Screw head: V8.3 Wave SCREWHEAD 45mm (BIG).stl

Old screw head will still work. but I have added wavy design to help user to release the screw without the key.

Please be aware, some designs out there will damage your 3M lock. especially ones that can put on in all angles.

UPDATE**
22-FEB

We have added 2 more versions: With messages;

2020 STAND WITH HONG KONG

And a thicker font version of HONG KONG - 5 DEMANDS NOT 1 LESS

UPDATE**
20-FEB

Added text on the front of the filter. Please make sure you Print facedown 0.15mm at a slower speed. Also make sure your first layer is well calibrated, other wise text will not appear as desired.

For any customisation that you would like, you can message me directly via facebook https://www.facebook.com/alpha.anderson

有個人喺Facebook上叫做 GT Lxxxxx 嚴重侵佔版權, 權違法販賣我的設計和相關產品。 我會保留法律追究權利。
我這些設計冇收過一分錢，完全是為香港人而設計，只是希望所有香港人能夠安全過到這個難關，你想要可以免費到城寨索取。

在我這邊有一班手足，不怕勞苦，慢慢踩夜車，出錢出力免費幫人印製， 為嘅就係香港呢個家而另一邊廂就有一些人好似GT Lxxxxx 喺度賺人血饅頭, 呢啲人應該呢啲人應該照下塊鏡，你阿媽冇教你乜嘢叫做做人嘅道德咩??

任何人想得到這些慮罐可以到這裏登記:
https://forms.gle/7TZyFtBD6EnYx41K6

UPDATE**
17-FEB

Updated the latest version of SCREW BASE.
3M 6200 V8 screw 45mm short v11.sti

This will replace all previous screw head and should fit to all printers, will solve all screw not fitting into thread issues.

解決了之前有人有扭唔到入去嘅問題,

對抗新型冠狀病毒裝備

THIS IS A version that fits a variety of filter sizes. From 36mm-41mm.

NO SUPPORT NEEDED.

And print without support.

用0.15mm layer 就可以. 每一set大概需時 8 小時

用0.20mm layer 就可以. 每一set大概需時 6小時

每一個防水外科口罩可以剪裁大概12個filter, 經過測試後每一個filter可以用超過一天

旋轉式設計, 飛沫難以沾上這個filter

螺絲頭沒法扭上的問題:

有兩個大小size, 45mm 和 42mm
如果45mm拎唔入, 嘗試用42 mm

If you have a Prusa M3S, just use original Prusa slicer, choose 0.15mm Speed Settings. Should complete 1 full set (a pair) within 8 hours.

Suggest to print in PLA, it will work with PETG, screw will be harder to turn.
PLA would give you the best result and PETG is not necessary in its intended use.

A normal mask could be cut in to at least 12 circle pieces. It will work with 2 layers of mask in each filter, but best to keep it single layer for a good flow of air into the Mask.

Note: you might want to use a knife to trim the top of the Screw head to make it easier to screw into the cap, but it is not necessary. Please print out the attached key wrench to help with tightening screw mechanism. For the 1st time, please use the key and turn it a few times to smoothen out the irregularity form differnt printer result. Please do not over tighten.

You will only need support on the bottom between the Shields.

Print it upside down, check photos.

Issue with the screw head:

Some had issued screwing the 2 parts together, this is usually due to the limitation of certain 3D printing, usually a proper calibration could fix this. Having said that, I have made 2 version of the screw head.

42mm and 45mm
The standard one is 45mm. But if you have issues screwing the 45mm in, please use the 42mm version.

UPDAET** PLEASE DO NOT USE PETG TO PRINT.
PLEASE USE PLA ONLY.
PETG MIGHT DAMAGE YOUR CONNECTOR and IT IS VERY DIFFICULT TO SCREW THE PARTS TOGETHER.