This is a fixture to allow owner/maintainers to quickly make a new airfilter for their Van's RV using a MA4-SPA carb. This allows the airfilter to be held in place and inverted to make the pro-seal process easier. Coating the PLA with silicone made removal easy. I used a very light coating of silicone grease using an acid brush and my fingers. There are 4 separate parts.

1 - The curved fixture without the pump housing. You will need 3 of these printed. They help hold the shape of the filter. Two on the bottom of the filter and one on the top opposite of the cut out.

2 & 3 - The curved fixture with the pump housing. There are two options here one with high walls on both sides and one with cutout on the inside. If your proseal flows due to high temps, the one with walls works best. I prefer the one with the cutout as I can squeeze pro-seal into the space easier to ensure a solid mass when done. You will need either one.

4 - The pump housing plug. This is used to validate your cutout. If you have a non-standard VAB cutout, you can use the plug coated in release agent to manually create the indent in the final filter. While this was still easier than doing it on the actual aircraft, it tended to shift slightly during drying with my practice pieces.

When completed, you need minimal clean up of the filter. I made sure to have ample transition between the pleats and the plug to prevent any cracking.