IPA filtration machine - EU version

This is an adaptation of Nick Wilson's clever IPA filtration machine, in this case for European DIY users. There are four main differences with respect to the original Wilson machine:

1. Very small footprint, aimed to fit inside an IKEA EU narrow cabinet (which is optional)
2. EU-specific equipment (e.g. the pump)
3. Bigger, longer and more powerful UV Loop Reactor
4. 3D printed custom parts related to point (1) (2) and (3), BTW that's why the description of this machine is finally here on Printables.

The IPA filtration machine in the compact IKEA METOD cabinet, without the wash bucket. Foreground: two stainless steel bulkhead couplings with gaskets (to be mounted onto the lid of the wash station)

Here is the BOM for this recycling filtration machine – EU variant:

• 5-meter of 12×18mm clear silicone tubing [AliExpress]
• 1× VEVOR 12VDC DPHC-T42 (45PSI) diaphragm pump [Vevor EU website]
• 2× 5m 12VDC UV LED strips (120 LEDs/m) (wrapped helically around 3.20m of tubing engaged circularly in the 3D printed UV loop reactor holder at the bottom. The cross-section and diameter of this transparent silicone torus is made to fit exactly the 10-meter UV LED strip wrapped helically around the UVLR) [AliExpress]
• 2× EIGER 10" filter housings [Amazon ASIN B09XY4L9PP] – or an equivalent if you can't source it, e.g. Geekpure ASIN B07LCKLP5K – with additional ¾" to ½" couplings in this case]
• 1× 1-micron 10" PP filter [Amazon or AliExpress]
• 1× 0.5-micron 10" PP filter [Amazon or AliExpress]
• 1× ½" BSPP MM nipple brass coupling (to connect the two filter housings) [AliExpress]
• 4× barbed ½" BSPP elbow brass fittings [AliExpress]
• 2× ½" NPT stainless steel bulkhead couplings with gaskets [AliExpress]
• 2× MF pairs of quick-release stainless steel barbed ½" NPT fittings (to easily detach and move the big wash container of an Anycubic Wash & Cure 3 Plus around) [AliExpress]
• 8× stainless steel hose clamp with screw tie [AliExpress or any DIY store]
• 1× PTFE plumber sealant tape [AliExpress or any DIY store]
• 1× custom 3D-printed shim to allow the pump to fit astride one of the filter housing brackets (mandatory for the whole equipment to fit within the specified height) – See the Files section
• 1× 240VAC to 12VDC 300W power supply [AliExpress]
• 1× Sonoff MINIR4M Matter-compatible smart switch [Amazon ASIN B0CLND5Q18 or AliExpress]
• An additional 1-meter of thinner 12×14mm clear silicone tubing is necessary to fit inside the wash container [AliExpress]
• Appropriate wood screws, electrical wires and WAGO connectors

The bulkhead passthrough and quick-release couplings also allow to keep the lid of the wash container hermetically closed during operation (preventing any IPA vapor from reaching electrical components – THIS IS CRITICAL). 

The IPA circulates in a loop in this closed-circuit with no gaseous O₂ inside. The resin diluted in a liquid form in the IPA precipitates under the curing action of the UV light in the coil reactor, little cured chunks that are then captured by the two micrometer filters in a row. The contaminated, opaque IPA is filtrated and becomes clear and efficient again after a few minutes of continuous operation. 

A welcome idiot-proof addition: when the wash container is not in there, the male output coupling from the filter housing outlet can mate with the female fitting of the pump inlet:

So that, in any lapse of concentration, if someone accidentally presses the start button, the IPA inside the tubing and filters just circulates in a closed loop without spilling everywhere.

All this equipment is attached to a vertical wooden tablet in the background (IKEA UTRUSTA shelf ref. 102.056.09) that is easily removable thanks to two handles (IKEA GUBBARP handle ref. 003.364.32) put on either side, and is fixed to the rear panel of a narrow IKEA METOD cabinet (ref. 302.056.32) using 2× 3D-printed custom hooks screwed in the rear upper part of the tablet (see the Files section). Everything including the big wash container fits inside this narrow cabinet with the door closed.

Here is the external (non waterproof) TRAYTON 300W 12VDC power supply [AliExpress] + custom 3D printed enclosure for Sonoff MINIR4M (see the Files section):

It powers the machine in the cabinet (in the background) at the press of the yellow button and stops it, either automatically after a 20-min filtration cycle (programmed in the eWeLink app), or manually with a second press anytime during a cycle.

You'll find the custom STLs (as well as STEP files) in the Files section (units: millimeters): pump shim, rear panel hook (×2), UV Loop Reactor holder, and MINIR4M cover for the TRAYTON power supply. You'll need a 3D printer able to print the ⌀ 25 cm base of the UV Loop Reactor holder – otherwise you'll have to remix and cut that part in four.

Remark #1: I don't give any AliExpress links as the Chinese change their price, delete their pages to recreate them immediately with a new URL (when it's not their entire shop) – Completely unreliable for a post meant to stay in the long run. You'll have to dig that yourself and find the best offer at the right moment.

Remark #2: isporopanol or ethanol can be effectively recycled that way in this machine. However, it happens that liquid resin canot cure when it is diluted in some specific resin detergents (as Sunlu Resin Detergent or ResinAway, among others) which means that the UV coil reactor would be inefective at precipitating the diluted resin into a spongy blob, making filtration challenging in this case. That said, some other resin detergents do in fact allow diluted resin to cure in them while exposed to UV, such as SAILSEA 3D Resin Detergent (only available in the US), Elegoo Photopolymer Resin Detergent, or FormuFutura EasyClean. Therefore, these products can be used with the filtration machine instead of IPA. Which also means that the filtration machine can alternatively run coupled to an ultrasonic cleaner instead of a wash station.