Hair Clipper Vacuum Attachment

Hair Clipper Vacuum Attachment.

Edit: THIS DOES NOT WORK! I'm leaving it here because it is an example of a FreeCAD design. My hair finally got long enough for me to prove to myself that this design does not work. The blades have so little space between them on this clipper that if you force all of the air through them, as this design does, there is not enough airflow to pull the hair into the blades. If you let enough air bypass the blades to get enough air flow, the hair bypasses the blades as well. I have some ideas on a different design, but that will take a while to implement.
End Edit.

Story time...
I ordered a Flowbee from Amazon at the start of the Covid Pandemic since going to a barber was not a good idea. I picked one of several vendors that claimed to have them in stock. This had a rather long estimated shipping time. About a month later, just when it was supposed to arrive, the vendor cancelled my order, and claimed they were out of stock. Of course, by this time, no vendor had it in stock.
I ordered a cheap normal hair clipper instead.
This turned out to be a good thing because I later learned that the flowbee will only cut 1/2" on the shortest setting, and I need 12mm and 3mm settings. I like to keep my hair short enough that I don't need to comb it.

The clipper I have cuts fine with the 3mm comb, but the 12mm comb tends to have trouble lifting hair up into the blades. It also tends to scatter clipped hair everywhere. I designed this so I could cut the hair on the top of my head faster, and not make a mess.

The 12mm version cuts pretty well. I have not yet tested the final design (I have to let my hair grow a bit) It is a bit awkward to use, but it gets the job done better than just the clippers alone. The three mm size has a flaw where if the orifice seals to your scalp, it will pull the skin towards the blades, and cut shorter than intended. I hope that I have fixed this with the vents I added, but I will need to wait for my hair to grow more so I can test.

The vacuum I used is probably 30 years old, but that part of the design is easy to adjust.
The clipper is this one:https://www.amazon.com/gp/product/B07RZFSCQQ/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
The clipper comb mounting system is likely to be unique to each clipper. I'm sure this design could be adapted to other clipper mounts, but this is certainly a more challenging design change than changing the vacuum attachment.

I architected this design differently that previous designs. I started with a master sketch with named constraints and named references. Unfortunately, FreeCADs autocomplete does not work properly with named constraints or references as it does with named spreadsheet values, but I could use them by typing out the whole name. It is kind of a mixed design as the master sketch only worked in two dimensions, and I had to use a spreadsheet for dimensions in the 3rd dimension.

The length that hair is cut can be adjusted in the Master sketch. I wish I could add comments to the sketch, but there is no way to do this yet. The attached file has the length of hair set to 3mm, and I narrowed the input orifice width to 5mm to minimize the amount that the vacuum can lift the scalp. You can make this orifice wider if you make the length of hair longer.

I used FreeCAD 0.19 for this. This version is not yet released, and I don't know if my design will work in the currently released version. 0.19 is as stable as any previous release now, and it is easy to download from the FreeCAD site.

Note: I uploaded all the files and saved the object. All the files disappeared. I uploaded the files again and published the object. The files were gone again. I edited the object and the files were back. I hope they show up eventually in the published object.