I saw the PLA printed screens here on carpokes that would take 4.5mm filter to make a cabin filter. That is probably the slickest variant for a cabin filter apart from the fact that I am in FL and things tend to get pretty hot.
All the other variants had some things I didn't like (paper elements-bad if they get wet/944online filter protrudes into wiring / thermocouple / actuator space , etc etc).
Here is my variant.
I used M4 stainless hex screws (M4 x 20) and locknuts as studs mounted on the OEM screen. Then I bought some stainless steel mesh for $7 on amazon. This allowed me to sandwich a 1/2" thick polyester electrostatic filter material in between the OEM screen and the stainless steel mesh. The "stud" is locked in place with washers and a nut; the stainless steel screen is captured between nut and locknut with washers on both sides and the studs punched through the material. Nothing will get sucked into the fan, filter material is waterproof and not paper, and easily changed, and nothing protruding outward.
944 Cabin Filter - Another variant
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'88 Porsche 944 Turbo S-Rose Silver
'01 Mercedes ML500-Brill. Silver
'16 BMW X5 40i-Space Grey
'20 BMW X1-M Sport-Blue
'20 BMW X1-Space Grey
21 Audi Q3 S Line -Cosmos Blue
Sold:
'06 Mercedes S55 AMG
'89 Saab 900 SPG Black
'86 Porsche 924S
'82 Porsche 924
'01 Mercedes ML500-Brill. Silver
'16 BMW X5 40i-Space Grey
'20 BMW X1-M Sport-Blue
'20 BMW X1-Space Grey
21 Audi Q3 S Line -Cosmos Blue
Sold:
'06 Mercedes S55 AMG
'89 Saab 900 SPG Black
'86 Porsche 924S
'82 Porsche 924
Yeah no snow in my backyard 
'88 Porsche 944 Turbo S-Rose Silver
'01 Mercedes ML500-Brill. Silver
'16 BMW X5 40i-Space Grey
'20 BMW X1-M Sport-Blue
'20 BMW X1-Space Grey
21 Audi Q3 S Line -Cosmos Blue
Sold:
'06 Mercedes S55 AMG
'89 Saab 900 SPG Black
'86 Porsche 924S
'82 Porsche 924
'01 Mercedes ML500-Brill. Silver
'16 BMW X5 40i-Space Grey
'20 BMW X1-M Sport-Blue
'20 BMW X1-Space Grey
21 Audi Q3 S Line -Cosmos Blue
Sold:
'06 Mercedes S55 AMG
'89 Saab 900 SPG Black
'86 Porsche 924S
'82 Porsche 924
