Today I test the 3DPSlots with 3 guides shooting with a 6D and the Canon 16-35 f2.8 with any vignetting at 16mm f2.8, in the next photos you can compare the shoots.

There are only some brands like Lucroit and Fotodiox (WonderPana) that can achieve this results with expensive holders+adapters. The 3DPSlots are designed to work with the Lee holder (Serk, Thefilterdude) and allow you to use 3 filters without any vignetting using ultra-wide lenses, the perfect harmony between the Badpter and the 3DPSlots allow you to take photos easily and faster than other offers. 

The problem
I tried some technologies to design the 3DPSlots and as a result of this experience I know what technology is necessary to produce the 3DPSlots, I will explain why the slots has to be plastic injected:

• 3D Printing: I build the first slots units 3D Printed technology (of course) and the problem is the color and the price. The material necessary to print the slots has to be flexible and the only available color is white, the other problem is the price, 3D printing is still very expensive for medium/large series of pieces. 
  
• CNC Machinig: The material color necessary to build the slots is not available and the unit cost is so high. The actual working version that I'm using to take photos ;) is CNC machined.
  
• Plastic injection: The cost of the unit is very cheap and there are any problem about colors, textures, etc, but is necessary to build a metal mold that is veeeery expensive.

Well, my deal is to achieve a cheap retail price for this 3DPSlots, I think that 6€ will be a good price, now I need your ideas about how can the 3DPSlots arrive to the market, I think that Crowdfounding it not a good solutions to this project due to it is very specific and with an small market, what do you think?.

If anyone has an idea, please post it.

Due to the limitation/cost of the printing materials we are playing and testing the fixations of the Badpter in injected ABS.
Also as you can see in the photo the new Lee compatible slots (3 guides) are ready to test in plastic ABS....
Debido a las limitaciones/coste del material impreso estamos "jugando" y probando las fijaciones del Badpter en plástico inyectado.
También como se puede ver en la foto las guías compatibles con el portafiltros Lee (3 guias) estas preparadas para probar en plástico ABS...

Yesterday I went with some Canonistas (thanks!!) people to test the slots with an EOS 5D Mark III and the EF 16-35 f/2.8L II USM, the day was not so suitable to take photos due to a powerful fog coming from the sea but I test the new slots design with excellent results.
Ayer fui a tomar una fotos con gente de Canonistas (gracias!!) para probar las nuevas guías con una EOS 5D Mark III y el EF 16-35 f/2.8L, el día que hizo no era el mas adecuado para hacer fotos debido a la niebla proveniente del mar pero pude probar las guías con excelentes resultados.

In the first test I used the original UW ring Lee adapter with the new slots, in the first shot the holder is at 90º and in the second at 45º.
En las primeras pruebas use el adaptador ultrangular original de Lee con las guías nuevas, en la primera toma el portafiltros estaba a 90º y en la segunda toma a 45º.

In the second test I used the C88L Badpter with the new slots, in the first shot the holder is at 90º and in the second at 45º.
En la segundas pruebas use el Badpter C88L con las guías nuevas, en la primera toma el portafiltros estaba a 90º y en la segunda toma a 45º.

The photos don't have any RAW adjustment and as you can see there aren't any vignetting....excellent!!!
Las fotos no tienen ningún ajuste del RAW y como se puede apreciar no hay nada de viñeteo....excelente!!!

Yes, it is possible and I will test a new design slot that don't have vignetting in a FF using a Canon 16-35 f/2.8  lens (theoretically).

These slots could be a good complement to do an improvement pack for the Lee holder in combination with the Badpter.