This is a cascade i've been building for a month or two (on and off, mostly off due to € shortage), it's main purpose will be dual-core benching, those small compressors are too weak to cool anything hotter anyway. All components are brand new except for the oil sep which i got dirt cheap on eBay.

As the project went on i was forced to buy myself my own equipment which took me some time since my budget doesn't stretch as i would like.

High temperature stage:
- compressor: Danfoss NL11F (1/3HP)
- condensor: Empor 0.72kW (200mm, three-row) + 10W 220Vac motor + 200mm fan blade
- filter/drier: Castel 20g /w service port
- refrigerant: R-507
- metering device: TC-28 (0.7mm ID) capilarity tube

Interstage heat exchanger:
- 10-plate stainless steel (rated up to 5kW water-water)

Low temperature stage:
- compressor: Danfoss NL11F (1/3HP)
- desuperheater / oil cooler: Empor 0.72kW (230mm, one-row) + 10W 220Vac motor + 230mm fan blade
- oil separator: Danfoss OUB-1 (floated)
- filter/drier: Danfoss 40g copper
- refrigerant: R-1150 - ethene / ethylene
- metering device: TC-31 (0.8mm ID) capilarity tube
- 2m stainless steel flexible suction line
- evaporator: tiborrr's Maze GT1 EE (extreme edition)

Safety:
- Ranco high pressure cut-off @ 27bar (on low temperature stage)
- 2x high pressure bourdon type pressure gauge Wigam
- Fach 0.9L receiver to act as an expansion tank 0.9L on low temp. stage

Initial preparations - lining up the component on a mock-up board:


Backbone of this cascade - 3mm steel plate:


The evaporator / suction line / safety - HPCO:


Manual hot gas bypass (to compressor, not into evaporator) - ball valve:


Temperature monitoring - K-types & Voltcraft K102 K-type thermometer:


Interstage heat-exchanger enclosure is made out of scrap wood - three major plates are 5mm, rest is 2mm:


Brazing the first stage:


First frost on first stage @ ~ -43°C:


Insulated with poliurethane foam (great specs, temperature conductivity ~ 0.039W/mK, neoprene has 0.036W/mK) it does ~ -53°C:


Ran out of oxygene to complete the second stage. Will continue the next weekend as i am away from home during the week.

Best regards,
Niko