Hi All, First post on the forum, it's amazing how many of us have had similar experiences.
I too after much experimentation am at the stage where I need to find the perfect material for my screen.
I played with tin foil, then tried the silver metal paint on the back of a large mirror, both with very pleasing results, but I wanted it big.
I have high ceilings and can easily accommodate a 2m x 3m screen, but live in a smallish flat so need to be able to put my screen away.
I have tried everything I can get sent (free or charged for) and have also spent around £40 on samples, from sheeting used in greenhouses to reflect light onto plants and obviously clothes fabrics to material used in west end style stage drops. my most successful material is a silver matt lame stage drop fabric which I favour most because unlike the others I would not need a join for a large screen and I find that any imperfection in the screen totally detracts from the experience (like a dirty pane of glass in the middle of someone's head) however although the depth of the 3D and the distance of the sticky out bits is far greater than on other tests, this material still reflects too much light and a noticeable quality loss is sustained.
My projectors are non-identical and both cost under £150 on eBay as used items. Although I have to have one projector sitting a foot in front of the other I can get great alignment within a minute of tinkering. I am using reald glasses lenses (rotated). A very unpretty setup but super cheap.
I have made a frame from black hard plastic electrical ducting which connects with nice little connectors, it looks well made but only cost about £25 and the 3m sections can be separated in the middle, the 4 1.5m sections then can be placed in a 2m cloth tube bag along with the 2m sections rolled into the screen material. The whole thing can hang from two ducting clips attached near my ceiling line.
Frustrated with my own slow progress, I have also purchased a pair of 3dmagic (i-art) pci wired LCD shutter glasses from way back in the day, for £1 and using a trick to enable nvidia3d vision without a 3dvision I can now also play games and watch movies (just about) on my 85hz dlp projector, (pretty cool when you think about it , projector £150, glasses £1 + any wall £free) not mentioning my badass pc. But 85 Hz is too low for long term use and the light loss on shutter glasses is too noticeable, plus I want my friends and family to be able to use their own reald glasses.
also I have a Blackmagic Intensity (about £100) which has real-time 1080p HDMI and RGB capture so I can plug in Xbox, PlayStation, Blu-ray etc. and then using the Blackmagic as a video source for Stereoscopic Player I can play 3D from any external source, if you just want RGB you can get a usb RGB capture device for about £30 on eBay.
so I just need my perfect screen material, something on a 2m or wider roll, and/or advice on how to improve the material I have but retain the ability to roll it away.