Resin Enclosure - Kotto fume extractor

This is an adapter for the Kotto fume extractor for use as a resin printer enclosure fume scrubber. This was made for the Wham Bam hot box resin enclosure, which I believe to be one of the best available resin enclosures. This system was designed and tested by Apolleon and myself. Credits to Apolleon (my son) for drawing up the designs with Fusion 360 much faster than I can.

This mod requires: 

A minimum of the (4) Exhaust pieces to work, (8) 10x1.75mm magnets, (4) M3x12 or M3x16 socket head bolts with (4) washers and (4) nuts to secure the exhaust. M3x12 may be a tight fit getting nuts on, but is what we used. The M3x16 are easier to install, but will protrude past the nut inside the enclosure. Washers go on the nut side only, none under the bolt head. Also recommended is to put cut-to-size active carbon filter inside the Kotto yellow fume catcher head that connects to the exhaust mod to help silence air flow. The Backing Plate_Template is used to place and cut the correct bolt holes and exhaust pass-thru hole into the Wham Bam enclosure and is then installed on the inside of the enclosure to provide even bolt force distribution and stop bolts from sinking into the enclosure.  Exhaust_1 Top and Bottom are for connecting to the Kotto fume head, and Exhaust_2 Top and Bottom connect to the enclosure. Install magnets into Exhaust_1 Bottom and Exhaust_2 Top so that the magnets are flat with surface that glues to its matching piece. CAUTION: Check your magnet polarity so they attract and do not repel. Magnets will be slightly below the outer surface. Glue the (2) Exhaust_1 pieces together (super glue) with glue under magnets also. Do the same for Exhaust_2 pieces. Use Black RTV to secure the yellow Kotto head inside the inset area of Exhaust_1 assembly. Use the backing_template to locate and cut pass-through hole and the (4) bolt holes. Recommended is closer to the top of the enclosure on the back of one of the sides, as seen in photos. This allows are to intake from the bottom Vent and better remove resin fumes. Mount Exhaust_2 assembly with Backing plate to enclosure. Depending on your printer and slicer, some post clean up may be required for magnet fitment and bolt holes. These were printed on calibrated Vyper.

The Vent is recommended, but not required, and requires (2) M3x16 socket head bolts with (4) washers and (2) nuts. Also recommended to put cut-to-size active carbon filter inside the Vent assembly. The Vent assembly is designed to fit the Wham Bam resin enclosure exhaust port and may not work for other enclosures. We use the Wham Bam exhaust port as an intake, as the Exhaust mod will have a new hole cut into the enclosure. The Vent piece with the raised ring pushes through from the inside and the flat piece with the cut is on the outside of the enclosure with the flat side up against the Wham Bam port flap.

The 90 degree is for positioning the Kotto extractor as needed.  The 90 degree adapter is intentionally slightly undersized on the connectors due to variances seen in the Kotto components. It is intended that you use cloth electrical tape (cloth type required) to adjust size as needed on both the male end of the 90, and the Kotto extractor flex pipe. See photo for example. Only 1 to 2 wraps are required. Fit should not be overly tight as forcing the flex tube into the 90 can separate the glued fitting of the 2 90 degree halves. Glue to 2 halves of the 90 together. Depending on your printer, some post work clean up on overhangs is needed to ensure fitment, and why this is printed in 2 pieces to aid in post work required.

For best fume extraction, we set the Kotto knob about 1/3rd to halfway. You do not want full fan speed as air scrubbing will be less affective.

NOTE: The photo showing the parts is for part illustration only. You must lay the 90 elbow pieces flat on the plate to print. These are thin parts, and were printed with PLA at 100% infill, which is recommended.

This mod may work for other resin enclosures, but not guaranteed. It was designed specifically for the Wham Bam resin hot box enclosure. See photos and message with any questions.